Drug seeking: a behavioral analysis in animals and humans.
D000818:Animals; D001519:Behavior / Q000187:drug effects; D001522:Behavior, Animal / Q000187:drug effects; D006801:Humans; D008960:Models, Psychological; D012054:Reinforcement, Psychology; D012646:Self Administration; D012907:Smoking / Q000523:psychology; D019966:Substance-Related Disorders / Q000523:psychology*