drugs
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1. DRUG ADDICTION
Many of the most widely used drugs affect the brain and other parts of the nervous system. These drugs include alcohol; the caffeine in cocoa, coffee, and tea; marijuana; narcotics, such as heroin and morphine; and sleeping pills. Altogether, five major kinds of drugs are known to affect the nervous system: (1) analgesics, (2) anaesthetics, (3) hallucinogens, (4) stimulants, and (5) depressants. Analgesics relieve pain without causing unconsciousness or diminishing the other senses, such as the sense of touch or taste. There are two main kinds of analgesics: (1) narcotics and (2) nonnarcotics. Both kinds relieve pain. But the narcotics also produce drowsiness, a dazed condition, and often a feeling of well-being.Doctors sometimes prescribe narcotics in treating certain disorders. For example, morphine is used to relieve the pain of severe injury and of cancer...