Methodological issues in research on smoking prevention.
D000293:Adolescent; D002648:Child; D005500:Follow-Up Studies; D006266:Health Education / Q000379:methods; D006801:Humans; D007258:Informed Consent; D011897:Random Allocation; D012106:Research; D000074606:Smoking Prevention; D012931:Social Environment; D012932:Social Facilitation