title: Seasonality in onset of youth smoking parallels seasonality in cigarette sales.
authors.forename: R J
authors.initials: RJ
authors.lastname: Wellman
authors.forename: J R
authors.initials: JR
authors.lastname: DiFranza
mesh_terms: D000293:Adolescent; D006801:Humans; D012621:Seasons; D012907:Smoking / Q000453:epidemiology*; D019460:Tobacco Industry / Q000191:economics*