title: Comparison of beliefs about e-cigarettes' harms and benefits among never users and ever users of e-cigarettes.
abstract: BACKGROUND
  E-cigarette use is rapidly increasing, especially among youth and young adults. We need to learn what factors are associated with uptake in e-cigarettes. One important set of predictors is beliefs about e-cigarettes' potential harms and benefits.
  
  
  METHODS
  Online survey data were collected in July, 2014 from 527 U.S. adults from a nationally representative online panel (KnowledgePanel) who reported being aware of e-cigarettes. Participants were asked to rate 7 statements related to e-cigarettes harms or benefits (e.g., breathing vapors from other people's e-cigarettes is harmful to my health; vaping or using e-cigarettes can help people quit smoking regular cigarettes completely). Responses were categorized into agree, disagree, or no opinion. We compared the proportions of agreement between respondents who ever used e-cigarettes and those who had never used. Multinomial logistic regression was used to predict agree or no opinion versus disagree (base outcome) for each belief. Relative risk ratios (RRRs) are reported. The analyses were completed in December, 2014 and were weighted to match the general U.S. adult population.
  
  
  RESULTS
  Agreement across the 7 beliefs ranged from 33% (vaping can help people quit smoking) to 56% (e-cigarettes make smoking look more acceptable to youth). Ever use of e-cigarettes was associated with lower relative risk of agreeing with statements about potential harms and higher relative risk of agreeing with statements about benefits (versus disagreeing) compared with never users.
  
  
  CONCLUSIONS
  These findings provide timely data on beliefs about e-cigarettes between e-cigarette users and non-users to inform potential message topics for health campaign interventions.
authors.affiliation: Dana-Farber Cancer Institute, Population Sciences Division, Center for Community Based Research, Boston, USA; Harvard TH Chan School of Public Health, Department of Social and Behavioral Sciences, Boston, USA. Electronic address: andy_tan@dfci.harvard.edu.
authors.forename: Andy S L
authors.initials: AS
authors.lastname: Tan
authors.affiliation: Seoul National University, Department of Communication, Seoul, Republic of Korea.
authors.forename: Chul-joo
authors.initials: CJ
authors.lastname: Lee
authors.affiliation: University of Illinois at Urbana-Champaign, Department of Communication, Urbana, USA.
authors.forename: Cabral A
authors.initials: CA
authors.lastname: Bigman
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001294:Attitude to Health; D003469:Culture; D066300:Electronic Nicotine Delivery Systems / Q000523:psychology*; D005260:Female; D006293:Health Promotion; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D012907:Smoking / Q000453:epidemiology / Q000523:psychology* / Q000628:therapy; D016540:Smoking Cessation / Q000523:psychology*; D011795:Surveys and Questionnaires; D014481:United States / Q000453:epidemiology; D055815:Young Adult
keywords: Beliefs; Benefits; Electronic cigarette; Harms; Public opinion; United States