Perceptions of Harm to Children Exposed to Secondhand Aerosol From Electronic Vapor Products, Styles Survey, 2015

Introduction The US Surgeon General has concluded that e-cigarette aerosol is not harmless and can contain harmful and potentially harmful chemicals, including nicotine. We assessed factors associated with adults’ perceptions of harm related to children’s exposure to secondhand aerosol from electronic vapor products (EVPs). Methods Data came from the 2015 Styles, an Internet panel survey of US adults aged 18 years or older (n = 4,127). Respondents were asked whether they believe aerosol from other people’s EVPs causes children harm. Harm perceptions were assessed overall and by cigarette smoking, EVP use, and sociodemographic characteristics. Multinomial logistic regression was used to assess odds of perceived harm. Results Overall, 5.3% of adults responded that secondhand EVP exposure caused “no harm” to children, 39.9% responded “little harm” or “some harm,” 21.5% responded “a lot of harm,” and 33.3% responded “don’t know.” Odds of “no harm” response were greater among men than among women, current and former cigarette smokers than among never smokers, and current and former EVP users than among never users; odds were lower among non-Hispanic blacks, Hispanics, and non-Hispanic other races than among non-Hispanic whites. Odds of responding “don’t know” were greater among men, current cigarette smokers, and current and former EVP users; odds were lower among those aged 45 to 64 years than those aged 18 to 24 years and lower among non-Hispanic other races and Hispanics than non-Hispanic whites. Conclusion Two-fifths of US adults believe that children’s exposure to secondhand EVP aerosol causes some or little harm, while one-third do not know whether it causes harm. Efforts are warranted to educate the public about the health risks of secondhand EVP aerosol, particularly for children.


Introduction
The US Surgeon General has concluded that e-cigarette aerosol is not harmless and can contain harmful and potentially harmful chemicals, including nicotine. We assessed factors associated with adults' perceptions of harm related to children's exposure to secondhand aerosol from electronic vapor products (EVPs).

Methods
Data came from the 2015 Styles, an Internet panel survey of US adults aged 18 years or older (n = 4,127). Respondents were asked whether they believe aerosol from other people's EVPs causes children harm. Harm perceptions were assessed overall and by cigarette smoking, EVP use, and sociodemographic characteristics. Multinomial logistic regression was used to assess odds of perceived harm.

Results
Overall, 5.3% of adults responded that secondhand EVP exposure caused "no harm" to children, 39.9% responded "little harm" or "some harm," 21.5% responded "a lot of harm," and 33.3% responded "don't know." Odds of "no harm" response were greater among men than among women, current and former cigarette smokers than among never smokers, and current and former EVP users than among never users; odds were lower among non-Hispanic blacks, Hispanics, and non-Hispanic other races than among non-Hispanic whites. Odds of responding "don't know" were greater among men, current cigarette smokers, and current and former EVP users; odds were lower among those aged 45 to 64 years than those aged 18 to 24 years and lower among non-Hispanic other races and Hispanics than non-Hispanic whites.

Introduction
Electronic vapor products (EVPs), also called electronic nicotine delivery systems, are devices designed to deliver nicotine and other additives to the user in the form of an aerosol, which is then exhaled by the user into the environment. Depending on the brand, EVP cartridges typically contain nicotine, a component to produce the aerosol (eg, propylene glycol or glycerol), and flavorings (eg, fruit, mint, chocolate). There are multiple types of EVPs on the US market, including e-cigarettes, e-hookahs, hookah pens, vape pens, and e-cigars; some of these products are disposable, while others can be refilled or recharged for repeated use. Some EVP marketing claims that they emit "harmless water vapor" (1,2) However, scientific evidence indicates that the aerosol emitted by EVPs may expose nonusers, including children and infants, to aerosolized nicotine and other potentially harmful substances, including heavy metals, ultrafine particulates, and volatile organic compounds; thus, this aerosol is not as safe as clean air (3). The US Surgeon General has concluded that e-cigarette aerosol is not harmless and that it can contain harmful and potentially harmful chemicals, including nicotine (4). Animal and human studies found that fetal and adolescent nicotine exposure can result in adverse health effects, including impaired brain and lung develop-ment (4,5). Nicotine exposure during pregnancy could result in low birthweight, preterm delivery, stillbirth, and sudden infant death syndrome (4).
Children and infants can be exposed to nicotine from secondhand EVP aerosol in numerous ways. Components of exhaled EVP aerosol are released into the atmosphere where it can be inhaled by others (2). These components can also settle on surfaces, where they can be ingested, inhaled, or absorbed through the skin by children and infants (2,3). Children and infants can be exposed to secondhand aerosol in numerous places, including private settings such as homes and vehicles as well as public places such as restaurants (5). Infants and children may be especially vulnerable to the possible harmful effects of substances in EVP aerosol in lower concentrations because of their smaller body weight and developing respiratory systems (3,5). Nicotine is toxic to infants and children if ingested, inhaled, or absorbed through skin. Additionally, nicotine exposure during periods of developmental vulnerability, from fetal through adolescent stages, can have multiple adverse health effects, including impaired brain and lung development (6).
Some studies indicate that young people and adults perceive EVPs as a safer alternative to conventional cigarettes, and some e-cigarette users perceive these products as a substitute for conventional cigarettes in places where smoking is not allowed (7-9). A 2014 analysis found that 88% of e-cigarette websites noted that they can be used anywhere, with 71% talking about the circumvention of public smoke-free laws (1). The potential for involuntary secondhand exposure to EVP aerosol among nonusers, children and adults alike, in public indoor environments is of increasing concern given that use of EVPs has increased considerably among US youths and adults in recent years (10,11).
One study of adults' perceptions of harm from secondhand EVP aerosol was conducted in Spain during 2013 through 2014; it found that nearly 70% of those surveyed believed that aerosol from EVP exposure was not harmful to nonusers in general (12). However, to our knowledge, no national study has examined perceived harm from secondhand EVP exposure in the United States among either adults or children. Because of the higher potential vulnerability of children to secondhand EVP exposure and the importance of determining population groups that will benefit most from public health messaging and interventions to reduce secondhand EVP exposure, we assessed perceptions of harm related to children's exposure to EVP aerosol among a nationally representative sample of US adults.

Data source
Data came from 2015 Styles, a series of seasonal national consumer surveys developed and fielded by Porter Novelli. Styles draws from KnowledgePanel, an Internet panel recruited by using address-based probability sampling to reach respondents regardless of landline telephone or Internet access (10). If needed, households are provided with a laptop computer and Internet access. Styles is conducted among a nationally representative sample of US adults aged 18 years or older. In 2015, a total of 4,127 participants completed Styles, a 67% response rate. Data were weighted to the US Census Current Population Survey distributions by using 9 factors: sex, age, annual household income, race/ ethnicity, household size, education level, US Census region, whether the respondent resided in a metropolitan statistical area, and whether the respondent had Internet access before the start of the survey (13). Data were de-identified for analysis, and the study was determined by the Centers for Disease Control and Prevention's Institutional Review Board to be exempt from human subjects review.

Measures
Adults' harm perceptions related to children's exposure to secondhand aerosol were assessed by the question "Do you believe that when children breathe the aerosol from other people's electronic vapor products that it causes . . . ?" Reponses options were "no harm," "little harm," "some harm," "a lot of harm," and "don't know." This measure was developed using established measures of tobacco-related harm perceptions, in consultation with subject matter experts, and subsequently cognitively tested to ensure validity.
Current cigarette smokers were respondents who reported smoking at least 100 cigarettes during their lifetime and who smoked cigarettes every day or some days at the time of the survey. Former smokers were respondents who reported having smoked at least 100 cigarettes in their lifetime and who smoked not at all at the time of survey. Never cigarette smokers were respondents who reported not having smoked 100 cigarettes in their lifetime.
Current EVP users were respondents who reported using any of the following EVPs in their lifetime and within the previous 30 days: "electronic cigarettes (e-cigarettes), such as Blu, 21st Century Smoke, or NJOY"; "electronic hookahs (e-hookahs), hookah pens, or vape pens, such as Starbuzz or Fantasia"; or "some other electronic vapor product such as electronic cigars (e-cigars) or electronic pipes (e-pipes)." Former EVP users were respondents who reported using EVPs at least once in their lifetime and who reported not using EVPs in the previous 30 days. Never EVP users were respondents who reported not using EVPs in their lifetime and not using EVPs in the previous 30 days. Four (<1%) respondents were excluded from the analyses because they answered that they had never used EVPs in their lifetime but had used EVPs in the previous 30 days.
Assessed sociodemographic variables were sex, age, race/ethnicity, educational attainment, annual household income, marital status, US Census region, and whether at least 1 child younger than 18 years lived in the respondent's household.

Analysis
Descriptive statistics were calculated to assess the distribution of harm perceptions by cigarette smoking, EVP use, and sociodemographic characteristics. We used χ 2 tests to assess significant differences between groups (P < .05). Adjusted multinomial logistic regression was conducted to determine the odds of "no harm," "little harm" or "some harm," and "don't know" responses compared with "a lot of harm" response. The adjusted model included all of the aforementioned cigarette smoking, EVP use, and sociodemographic characteristics. Analyses were conducted by using SAS version 9.3 (SAS Institute, Inc), and data were weighted to adjust for selection and nonresponse.

Results
A total of 4,127 adults completed the survey. The sociodemographic distribution of respondents was as follows: women, 52%; aged 45 to 64 years, 35%; non-Hispanic white, 66%; high school graduates, 30%; annual household income of $50,000 to $99,999, 35%; married, 60%; live in the South, 37%; and no children younger than 18 years living in the household, 72%. Approximately 14% were current cigarette smokers and 5% were current EVP users.

Discussion
Our findings reveal that 22% of US adults believe that exposure to secondhand EVP aerosol causes a lot of harm to children, 40% believe it causes little or some harm, 5% believe it causes no harm, and an additional one-third of adults reported not knowing whether secondhand EVP aerosol exposure causes harm to children. Current cigarette smokers and EVP users had greater odds of reporting that exposure to secondhand EVP aerosol causes "no harm" or "little harm" or "some harm" to children compared with never cigarette smokers and never EVP users. However, scientific evidence indicates that EVP aerosol exhaled into the air potentially exposes nonusers to aerosolized nicotine and other harmful and potentially harmful substances, including heavy metals, ultrafine particulates, and volatile organic compounds (1-5). Nicotine exposure during periods of developmental vulnerability, from PREVENTING CHRONIC DISEASE VOLUME 14, E41 PUBLIC HEALTH RESEARCH, PRACTICE, AND POLICY

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The opinions expressed by authors contributing to this journal do not necessarily reflect the opinions of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions.
www.cdc.gov/pcd/issues/2017/16_0567.htm • Centers for Disease Control and Prevention fetal through adolescent stages, may have multiple adverse health effects, including impaired brain and lung development (2-6). The fact that many adults did not know whether there are harms associated with children's exposure to EVP aerosol, and some incorrectly believed there were no harms, underscores the importance of educating the public on the health risks of secondhand EVP aerosol exposure for nonusers, particularly children (4).
Variations in perceived harm were observed across sociodemographic groups, even after adjusting for current cigarette smoking and EVP use. More specifically, the odds of responding "no harm," "little harm" or "some harm," or "don't know" was greatest among men and non-Hispanic whites. These variations in harm perceptions may be the result of multiple factors, including use of other forms of tobacco use among these individuals, marketing messages that downplay the potential health risks of EVP use or exposure to EVP aerosol, or factors related to social disapproval of smoking or EVP use (4,14). These sociodemographic differences suggest that public health education may be warranted to inform the public about the potential health risks of exposure to EVP aerosol, especially for children.
The 2016 Surgeon General's Report on e-cigarette use among youth and young adults concluded that e-cigarette aerosol is not harmless and stated, "Smokefree indoor air policies should be updated to prohibit the use of both conventional cigarettes and e-cigarettes, thereby preserving standard for clean indoor air" (4). As of December 2016, eight states (California, Delaware, Hawaii, Maine, North Dakota, New Jersey, Oregon, and Utah) and 507 localities have enacted comprehensive smoke-free laws that prohibit conventional smoking and EVP use in all indoor areas of work sites, restaurants, and bars (15). However, most of the US population is not protected by laws that specifically prohibit EVP use (16). Momentum to protect nonusers, particularly children, from exposure to secondhand aerosol in public areas may be impeded by lack of knowledge about the potential harms of secondhand EVP aerosol as well EVP advertising messages. Some EVP marketing includes unproven claims of safety as well as statements that the products are exempt from smoke-free policies, which may not be true in all states (1). These messages could undermine clean indoor air standards by encouraging people to use EVPs as substitutes for conventional smoking in areas where conventional smoking is prohibited. Clean indoor air standards protect from exposure to secondhand smoke and aerosol and have been shown to help reduce initiation of smoking and use of tobacco among young people by denormalizing tobacco use. (17). In addition, because some e-cigarettes (eg, cigalikes) are designed to mimic smoking, allowing EVP use in places where smoking is prohibited could complicate enforcement of smoke-free policies (15). In addition to public places, private settings such as homes and vehicles are locations where children may also be exposed to secondhand EVP aerosol. Across the United States, 18.9% of adults do not have voluntary smoke-free home rules and 26.4% do not have smoke-free vehicle rules (18). By establishing 100% smoke-free home and vehicle rules that also include EVPs, parents and caregivers can protect the health of their children and help prevent exposure to secondhand EVP aerosol among children in their care.
In addition to prohibiting EVP use in indoor areas, other population-based public health interventions are warranted to protect the public, particularly children, from possible harmful effects of secondhand EVP aerosol exposure. Strategies could include informing the public about the potential harmful effects of secondhand EVP aerosol (15). Promoting tobacco-free norms, fully enforcing smoke-free laws that include EVP use, and educating the public about the harms related to secondhand EVP exposure for children could reduce the risk of exposure in children (15). When addressing potential public health harms associated with EVP use and secondhand exposure to EVP aerosol, it is important to implement the strategies promoted by the US Surgeon General to prevent and reduce the use of all forms of tobacco, including tobacco price increases, comprehensive smoke-free laws that include EVPs, high-impact antitobacco media campaigns, barrier-free cessation treatment and services, and comprehensive statewide tobacco control programs (18). Using a comprehensive approach, as well as educating the public on the dangers of nicotine exposure among children and adolescents, could reduce secondhand EVP exposure among nonusers and the misperception that EVP aerosol is harmless.
The findings of this study are subject to some limitations. First, respondents were recruited from a list of web panelists, which may limit generalizability. However, Styles data were weighted to be nationally representative of the US adult population, and tobacco use estimates from Styles are consistent with other national household surveys of US adults (19). Second, because of the questions available on the Styles survey, former EVP use was ascertained using ever use as a threshold for regular use. Given that it was not possible to distinguish between former EVP users who routinely used the products and those who only briefly experimented with the products, this classification could introduce bias. Third, limitations related to questionnaire content and variations in question comparability prevented the assessment of harm perceptions by other tobacco product use, cigarette smoking behaviors (eg, quit attempts), and type of EVP use (eg, disposable, mid-sized, tank system). We attempted to study dual use; however, because the number of respondents that reported being current cigarette smokers and current EVP users in our sample was low (113 [2.9%] using weighted data), it was not possible to assess this PREVENTING CHRONIC DISEASE VOLUME 14, E41 PUBLIC HEALTH RESEARCH, PRACTICE, AND POLICY

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The opinions expressed by authors contributing to this journal do not necessarily reflect the opinions of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. measure in more nuance because of unstable estimates and large relative standard errors. Fourth, self-reporting of smoking status and EVP use could lead to misclassification bias; the validity of self-reported smoking is well-established (20), but the validity of self-reported EVP use is uncertain. Finally, because the EVP product landscape is rapidly changing, EVP use may be underestimated if EVP users referred to the products they used with terminology other than what was provided in the questionnaire. However, multiple EVP product examples and terminologies were included in the question to minimize the potential for misclassification bias.
In conclusion, current and former cigarette smokers and EVP users had greater odds than nonusers of perceiving no harm toward children exposed to EVP aerosol. Variations in harm perceptions were also observed across sexes and race/ethnicities. EVP use potentially exposes nonusers, including children, to aerosolized nicotine and other harmful substances (1-6). Therefore, clean air -free of both smoke and EVP aerosol -remains the standard to protect health. In coordination with a comprehensive approach to prevent and reduce secondhand smoke exposure and tobacco use by young people, efforts are warranted to educate the public, particularly current and former cigarette smokers and EVP users, about the potential health risks of secondhand EVP aerosol exposure among children.  Abbreviation: CI, confidence interval. a Data came from 2015 Styles, a series of seasonal national consumer surveys developed and fielded by Porter Novelli. Styles draws from KnowledgePanel, an Internet panel recruited by using address-based probability sampling to reach respondents regardless of landline telephone or Internet access (10). If needed, households are provided with a laptop computer and Internet access. Styles is conducted among a nationally representative sample of US adults aged 18 years or older. b Defined as responding "no harm," "little harm," "some harm," "a lot of harm," or "don't know" to the question "Do you believe that when children breathe the aerosol from other people's electronic vapor products that it causes . . .?" c Sum of sample observations may not add up to total population because of missing data. d Significant χ 2 test (P < .05) across harm-perception groups within the specified characteristic. e Result not presented because relative standard error >30%. f Northeast: Connecticut, Maine, Massachusetts, New Jersey, New Hampshire, New York, Pennsylvania, Rhode Island, and Vermont; Midwest: Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Nebraska, North Dakota, Ohio, South Dakota, and Wisconsin; South: Alabama, Arkansas, Delaware, District of Columbia, Florida, Georgia, Kentucky, Louisiana, Maryland, Mississippi, North Carolina, Oklahoma, South Carolina, Tennessee, Texas, Virginia, and West Virginia; West: Alaska, Arizona, California, Colorado, Hawaii, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, and Wyoming. g Defined as responding yes to having at least one child under the age of 18 years living in the household. h Current cigarette smokers were defined as respondents who reported smoking at least 100 cigarettes during their lifetime and currently smoking cigarettes "every day" or "some days." Former smokers were defined as respondents who reported having smoked at least 100 cigarettes in their lifetime and who reported smoking "not at all" at the time of survey. Never cigarette smokers were defined as respondents who reported not having smoked 100 cigarettes in their lifetime. i Current EVP users were defined as respondents who reported using any of the following products in their lifetime and within the previous 30 days: "electronic cigarettes (e-cigarettes), such as Blu, 21st Century Smoke, or NJOY"; "electronic hookahs (e-hookahs), hookah pens, or vape pens, such as Starbuzz or Fantasia"; or "some other electronic vapor product such as electronic cigars (e-cigars) or electronic pipes (e-pipes)." Former EVP users were defined as respondents who reported using EVPs at least once in their lifetime and who reported not using EVPs in the previous 30 days. Never EVP users were defined as respondents who reported not using EVPs in their lifetime and not using EVPs in the previous 30 days.   ternet panel recruited by using address-based probability sampling to reach respondents regardless of landline telephone or Internet access (10). If needed, households are provided with a laptop computer and Internet access. Styles is conducted among a nationally representative sample of US adults aged 18 years or older. b Defined as responding "no harm," "little harm," "some harm," "a lot of harm," or "don't know" to the question "Do you believe that when children breathe the aerosol from other people's electronic vapor products that it causes . . .?" c Sum of sample observations may not add up to total population because of missing data. d Significant χ 2 test (P < .05) across harm-perception groups within the specified characteristic. e Result not presented because relative standard error >30%. f Northeast: Connecticut, Maine, Massachusetts, New Jersey, New Hampshire, New York, Pennsylvania, Rhode Island, and Vermont; Midwest: Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Nebraska, North Dakota, Ohio, South Dakota, and Wisconsin; South: Alabama, Arkansas, Delaware, District of Columbia, Florida, Georgia, Kentucky, Louisiana, Maryland, Mississippi, North Carolina, Oklahoma, South Carolina, Tennessee, Texas, Virginia, and West Virginia; West: Alaska, Arizona, California, Colorado, Hawaii, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, and Wyoming. g Defined as responding yes to having at least one child under the age of 18 years living in the household. h Current cigarette smokers were defined as respondents who reported smoking at least 100 cigarettes during their lifetime and currently smoking cigarettes "every day" or "some days." Former smokers were defined as respondents who reported having smoked at least 100 cigarettes in their lifetime and who reported smoking "not at all" at the time of survey. Never cigarette smokers were defined as respondents who reported not having smoked 100 cigarettes in their lifetime. i Current EVP users were defined as respondents who reported using any of the following products in their lifetime and within the previous 30 days: "electronic cigarettes (e-cigarettes), such as Blu, 21st Century Smoke, or NJOY"; "electronic hookahs (e-hookahs), hookah pens, or vape pens, such as Starbuzz or Fantasia"; or "some other electronic vapor product such as electronic cigars (e-cigars) or electronic pipes (e-pipes)." Former EVP users were defined as respondents who reported using EVPs at least once in their lifetime and who reported not using EVPs in the previous 30 days. Never EVP users were defined as respondents who reported not using EVPs in their lifetime and not using EVPs in the previous 30 days.    (10). If needed, households are provided with a laptop computer and Internet access. Styles is conducted among a nationally representative sample of US adults aged 18 years or older. b Defined as responding "no harm," "little harm," "some harm," "a lot of harm," or "don't know" to the question "Do you believe that when children breathe the aerosol from other people's electronic vapor products that it causes . . .?" c Sum of sample observations may not add up to total population because of missing data. d Significant χ 2 test (P < .05) across harm-perception groups within the specified characteristic. e Result not presented because relative standard error >30%. f Northeast: Connecticut, Maine, Massachusetts, New Jersey, New Hampshire, New York, Pennsylvania, Rhode Island, and Vermont; Midwest: Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Nebraska, North Dakota, Ohio, South Dakota, and Wisconsin; South: Alabama, Arkansas, Delaware, District of Columbia, Florida, Georgia, Kentucky, Louisiana, Maryland, Mississippi, North Carolina, Oklahoma, South Carolina, Tennessee, Texas, Virginia, and West Virginia; West: Alaska, Arizona, California, Colorado, Hawaii, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, and Wyoming. g Defined as responding yes to having at least one child under the age of 18 years living in the household. h Current cigarette smokers were defined as respondents who reported smoking at least 100 cigarettes during their lifetime and currently smoking cigarettes "every day" or "some days." Former smokers were defined as respondents who reported having smoked at least 100 cigarettes in their lifetime and who reported smoking "not at all" at the time of survey. Never cigarette smokers were defined as respondents who reported not having smoked 100 cigarettes in their lifetime. i Current EVP users were defined as respondents who reported using any of the following products in their lifetime and within the previous 30 days: "electronic cigarettes (e-cigarettes), such as Blu, 21st Century Smoke, or NJOY"; "electronic hookahs (e-hookahs), hookah pens, or vape pens, such as Starbuzz or Fantasia"; or "some other electronic vapor product such as electronic cigars (e-cigars) or electronic pipes (e-pipes)." Former EVP users were defined as respondents who reported using EVPs at least once in their lifetime and who reported not using EVPs in the previous 30 days. Never EVP users were defined as respondents who reported not using EVPs in their lifetime and not using EVPs in the previous 30 days.   Abbreviations: CI, confidence interval; AOR, adjusted odds ratio. a Data came from 2015 Styles, a series of seasonal national consumer surveys developed and fielded by Porter Novelli. Styles draws from KnowledgePanel, an Internet panel recruited by using address-based probability sampling to reach respondents regardless of landline telephone or Internet access (10). If needed, households are provided with a laptop computer and Internet access. Styles is conducted among a nationally representative sample of US adults aged 18 years or older. b Defined as responding "no harm," "little harm," "some harm," "a lot of harm," or "don't know" to the question "Do you believe that when children breathe the aerosol from other people's electronic vapor products that it causes . . .?" Those who responded "no harm," "little harm" or "some harm," or "don't know" were each compared with those who responded "a lot of harm." Multinomial logistic regression model was adjusted for all covariates listed in the e Current cigarette smokers were defined as respondents who reported smoking at least 100 cigarettes during their lifetime and currently smoking cigarettes "every day" or "some days." Former smokers were defined as respondents who reported having smoked at least 100 cigarettes in their lifetime and who reported smoking "not at all" at the time of survey. Never cigarette smokers were defined as respondents who reported not having smoked 100 cigarettes in their lifetime. f Current EVP users were defined as respondents who reported using any of the following products in their lifetime and within the previous 30 days: "electronic cigarettes (e-cigarettes), such as Blu, 21st Century Smoke, or NJOY"; "electronic hookahs (e-hookahs), hookah pens, or vape pens, such as Starbuzz or Fantasia"; or "some other electronic vapor product such as electronic cigars (e-cigars) or electronic pipes (e-pipes)." Former EVP users were defined as respondents who reported using EVPs at least once in their lifetime and who reported not using EVPs in the previous 30 days. Never EVP users were defined as respondents who reported not using EVPs in their lifetime and not using EVPs in the previous 30 days.

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(continued on next page) Abbreviations: CI, confidence interval; AOR, adjusted odds ratio. a Data came from 2015 Styles, a series of seasonal national consumer surveys developed and fielded by Porter Novelli. Styles draws from KnowledgePanel, an Internet panel recruited by using address-based probability sampling to reach respondents regardless of landline telephone or Internet access (10). If needed, households are provided with a laptop computer and Internet access. Styles is conducted among a nationally representative sample of US adults aged 18 years or older. b Defined as responding "no harm," "little harm," "some harm," "a lot of harm," or "don't know" to the question "Do you believe that when children breathe the aerosol from other people's electronic vapor products that it causes . . .?" Those who responded "no harm," "little harm" or "some harm," or "don't know" were each compared with those who responded "a lot of harm." Multinomial logistic regression model was adjusted for all covariates listed in the e Current cigarette smokers were defined as respondents who reported smoking at least 100 cigarettes during their lifetime and currently smoking cigarettes "every day" or "some days." Former smokers were defined as respondents who reported having smoked at least 100 cigarettes in their lifetime and who reported smoking "not at all" at the time of survey. Never cigarette smokers were defined as respondents who reported not having smoked 100 cigarettes in their lifetime. f Current EVP users were defined as respondents who reported using any of the following products in their lifetime and within the previous 30 days: "electronic cigarettes (e-cigarettes), such as Blu, 21st Century Smoke, or NJOY"; "electronic hookahs (e-hookahs), hookah pens, or vape pens, such as Starbuzz or Fantasia"; or "some other electronic vapor product such as electronic cigars (e-cigars) or electronic pipes (e-pipes)." Former EVP users were defined as respondents who reported using EVPs at least once in their lifetime and who reported not using EVPs in the previous 30 days. Never EVP users were defined as respondents who reported not using EVPs in their lifetime and not using EVPs in the previous 30 days.