[1] Kings Coll London, Inst Psychiat Psychol & Neurosci, Dept Basic & Clin Neurosci, London, England
[2] Ctr Addict & Mental Hlth, Social & Epidemiol Res Dept, London, ON, Canada
[3] Western Univ, Dept Epidemiol & Biostat, London, ON, Canada
[4] Univ Toronto, Dalla Lana Sch Publ Hlth, Toronto, ON, Canada
[5] Univ Waterloo, Dept Psychol, Waterloo, ON, Canada
[6] Univ Waterloo, Sch Publ Hlth & Hlth Syst, Waterloo, ON, Canada
[7] Ontario Inst Canc Res, Toronto, ON, Canada
[8] Chinese Ctr Dis Control & Prevent, Tobacco Control Off, Beijing, Peoples R China
[9] Kings Coll London, Inst Psychiat Psychol & Neurosci, Dept Addict, London, England
[10] UK Ctr Tobacco & Alcohol Studies, Nottingham, England
[11] Kings Coll London, Inst Psychiat Psychol & Neurosci IoPPN, Addict Dept, Addict Sci Bldg,4 Windsor Walk,Denmark Hill, London SE5 8BB, England