title: Change in variables related to smoking from childhood to late adolescence: an eight year longitudinal study of a cohort of elementary school students.
mesh_terms: D000293:Adolescent; D001294:Attitude to Health; D002170:Canada; D002648:Child; D005500:Follow-Up Studies; D006293:Health Promotion / Q000379:methods*; D006801:Humans; D000074606:Smoking Prevention