Article Text
Research letter
Typologies of smokers and non-smokers: encouraging changes over time
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Footnotes
Competing interests None.
Patient consent Obtained.
Ethics approval This study was conducted with the approval of the Ontario Tobacco Survey, which provides the data for this study, has been granted ethics approval at the offices of research ethics at both the University of Toronto and the University of Waterloo.
Provenance and peer review Not commissioned; externally peer reviewed.