title: Commentary on Prince van Leeuwen et al. (2014): Tobacco and cannabis use.
authors.affiliation: Christchurch Health and Development Study, Department of Psychological Medicine, University of Otago, Christchurch, PO Box 4345, Christchurch, 8140, New Zealand. dm.fergusson@otago.ac.nz.
authors.forename: David M
authors.initials: DM
authors.lastname: Fergusson
authors.forename: Joseph M
authors.initials: JM
authors.lastname: Boden
mesh_terms: D000428:Alcohol Drinking / Q000523:psychology*; D005260:Female; D006801:Humans; D008297:Male; D002189:Marijuana Abuse / Q000209:etiology*; D012907:Smoking / Q000523:psychology*
keywords: Alcohol; cannabis; gateway theory; longitudinal study; route of administration (ROA); tobacco