On the preferential abuse of heroin and amphetamine.
D000223:Adaptation, Psychological; D000661:Amphetamine; D001007:Anxiety; D003674:Defense Mechanisms; D004532:Ego; D003932:Heroin; D006801:Humans; D010551:Personality; D010553:Personality Development; D012095:Repression-Sensitization; D012649:Self Concept; D012945:Social Values; D019966:Substance-Related Disorders
D003932:Heroin; D000661:Amphetamine