Adolescents' acquisition of cigarettes through noncommercial sources.
DiFranza
Joseph R
JR
D000293:Adolescent; D000294:Adolescent Behavior; D006801:Humans; D012907:Smoking / Q000453:epidemiology*; D013781:Texas / Q000453:epidemiology; D014026:Nicotiana; D019460:Tobacco Industry