Prevalence of vaping and smoking among adolescents in Canada, England, and the United States: repeat national cross sectional surveys
Study noted increased youth vaping, particularly with regards to experimentation, and claimed an increased youth smoking rate.
Canadian sample pool showed a statistical ethnicity change between wave 1 (2017) and wave 2 (2018) that was not reflected in the UK and U.S. Sample pools.
Claims of increased smoking rates were not reflected in Statistics Canada data released shortly after this study was published.
Lead author selectively released portions of this data to officials and news media prior to completion of peer review and publication of the study driving a significant narrative and reaction prior to full publication of all data.
The British Medical Journal
David Hammond, Jessica L Reid, Vicki L Rynard, Geoffrey T Fong, K Michael Cummings, Ann McNeill, Sara Hitchman, James F Thrasher, Maciej L Goniewicz, Maansi Bansal-Travers, Richard O’Connor, David Levy, Ron Borland, Nigel Gray, Christine M White
David Hammond et al. Prevalence of vaping and smoking among adolescents in Canada, England, and the United States: repeat national cross sectional surveys. BMJ 2019;365:l2219