A six-year analysis of patterns in non-medical drug use behavior.
D000428:Alcohol Drinking; D000662:Amphetamines; D001463:Barbiturates; D002188:Cannabis; D003042:Cocaine; D006801:Humans; D008238:Lysergic Acid Diethylamide; D009294:Narcotics; D012945:Social Values; D013334:Students; D019966:Substance-Related Disorders; D014481:United States; D014495:Universities
D000662:Amphetamines; D001463:Barbiturates; D009294:Narcotics; D008238:Lysergic Acid Diethylamide; D003042:Cocaine