title: Associations Between E-Cigarette Type, Frequency of Use, and Quitting Smoking: Findings From a Longitudinal Online Panel Survey in Great Britain.
abstract: BACKGROUND
  E-cigarettes can be categorized into two basic types, (1) cigalikes, that are disposable or use pre-filled cartridges and (2) tanks, that can be refilled with liquids. The aims of this study were to examine: (1) predictors of using the two e-cigarette types, and (2) the association between type used, frequency of use (daily vs. non-daily vs. no use), and quitting.
  
  
  METHODS
  Online longitudinal survey of smokers in Great Britain was first conducted in November 2012. Of 4064 respondents meeting inclusion criteria at baseline, this study included (N = 1643) current smokers followed-up 1 year later. Type and frequency of e-cigarette use were measured at follow-up.
  
  
  RESULTS
  At follow-up, 64% reported no e-cigarette use, 27% used cigalikes, and 9% used tanks. Among e-cigarette users at follow-up, respondents most likely to use tanks versus cigalikes included: 40-54 versus 18-24 year olds and those with low versus moderate/high education. Compared to no e-cigarette use at follow-up, non-daily cigalike users were less likely to have quit smoking since baseline (P = .0002), daily cigalike or non-daily tank users were no more or less likely to have quit (P = .3644 and P = .4216, respectively), and daily tank users were more likely to have quit (P = .0012).
  
  
  CONCLUSIONS
  Whether e-cigarette use is associated with quitting depends on type and frequency of use. Compared with respondents not using e-cigarettes, daily tank users were more likely, and non-daily cigalike users were less likely, to have quit. Tanks were more likely to be used by older respondents and respondents with lower education.
authors.affiliation: Department of Addictions, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, United Kingdom; UK Centre for Tobacco and Alcohol Studies, United Kingdom; sara.hitchman@kcl.ac.uk.
authors.forename: Sara C
authors.initials: SC
authors.lastname: Hitchman
authors.affiliation: Department of Addictions, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, United Kingdom; UK Centre for Tobacco and Alcohol Studies, United Kingdom;
authors.forename: Leonie S
authors.initials: LS
authors.lastname: Brose
authors.affiliation: Health Behaviour Research Centre, University College London, London, United Kingdom.
authors.forename: Jamie
authors.initials: J
authors.lastname: Brown
authors.affiliation: Department of Addictions, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, United Kingdom; UK Centre for Tobacco and Alcohol Studies, United Kingdom;
authors.forename: Debbie
authors.initials: D
authors.lastname: Robson
authors.affiliation: Department of Addictions, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, United Kingdom; UK Centre for Tobacco and Alcohol Studies, United Kingdom;
authors.forename: Ann
authors.initials: A
authors.lastname: McNeill
mesh_terms: D000293:Adolescent; D000328:Adult; D066300:Electronic Nicotine Delivery Systems / Q000706:statistics & numerical data*; D005260:Female; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D012907:Smoking / Q000453:epidemiology; D016540:Smoking Cessation / Q000379:methods / Q000706:statistics & numerical data*; D000074606:Smoking Prevention; D012959:Socioeconomic Factors; D014029:Tobacco Use Disorder; D006113:United Kingdom / Q000453:epidemiology; D055815:Young Adult