Habituation to, abuse of, and/or addiction to a chemical substance. Largely because of psychological craving, the life of he drug-dependent person revolves around the need for the specific effect of one or more chemical agents on mood or state of consciousness. The term thus includes not only the addiction (which emphasizes the physiological dependence) but also drug abuse (in which the pathological craving for drugs seems unrelated to physical dependence). Examples include alcohol, opiates, synthetic analgesics with morphine-like effects, barbiturates, other hypnotics, sedatives, some antianxiety agents, cocaine, psychostimulants, marijuana, and psychotomimetic drugs.












   

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