title: Mining data on usage of electronic nicotine delivery systems (ENDS) from YouTube videos.
abstract: OBJECTIVE
  The objective was to analyse and compare puff and exhalation duration for individuals using electronic nicotine delivery systems (ENDS) and conventional cigarettes in YouTube videos.
  
  
  METHODS
  Video data from YouTube videos were analysed to quantify puff duration and exhalation duration during use of conventional tobacco-containing cigarettes and ENDS. For ENDS, comparisons were also made between 'advertisers' and 'non-advertisers', genders, brands of ENDS, and models of ENDS within one brand.
  
  
  RESULTS
  Puff duration (mean =2.4 s) for conventional smokers in YouTube videos (N=9) agreed well with prior publications. Puff duration was significantly longer for ENDS users (mean =4.3 s) (N = 64) than for conventional cigarette users, and puff duration varied significantly among ENDS brands. For ENDS users, puff duration and exhalation duration were not significantly affected by 'advertiser' status, gender or variation in models within a brand. Men outnumbered women by about 5:1, and most users were between 19 and 35 years of age.
  
  
  CONCLUSIONS
  YouTube videos provide a valuable resource for studying ENDS usage. Longer puff duration may help ENDS users compensate for the apparently poor delivery of nicotine from ENDS. As with conventional cigarette smoking, ENDS users showed a large variation in puff duration (range =1.9-8.3 s). ENDS puff duration should be considered when designing laboratory and clinical trials and in developing a standard protocol for evaluating ENDS performance.
authors: Department of Cell Biology & Neuroscience, University of California, Riverside, CA 92521, USA.
authors: My
authors: M
authors: Hua
authors: Henry
authors: H
authors: Yip
authors: Prue
authors: P
authors: Talbot
mesh_terms: D000280:Administration, Inhalation; D000293:Adolescent; D000328:Adult; D000329:Advertising; D057225:Data Mining / Q000379:methods; D016503:Drug Delivery Systems; D045853:Exhalation; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009538:Nicotine / Q000008:administration & dosage*; D012907:Smoking / Q000503:physiopathology; D016540:Smoking Cessation / Q000379:methods; D061108:Social Media; D013997:Time Factors; D061485:Tobacco Use Cessation Devices; D014741:Video Recording; D055815:Young Adult
chemical_list: D009538:Nicotine