From the Centers for Disease Control. Accessibility of cigarettes to youths aged 12-17.
D000293:Adolescent; D000294:Adolescent Behavior; D002648:Child; D003132:Commerce; D007722:Health Knowledge, Attitudes, Practice; D006801:Humans; D012907:Smoking / Q000191:economics / Q000453:epidemiology*; D014481:United States / Q000453:epidemiology