Hallucinogen While many drugs speed up or depress the central nervous system, there is a class of drugs that distorts how we feel, hear, see, smell, taste, and think. Called hallucinogens because users often hallucinate, or experience nonexistent sensations, these drugs are also known as psychedelic, or mind-bending, drugs. Some hallucinogens come from natural sources; others are made in laboratories. Examples of natural hallucinogens are mescaline, psilocybin, DMT, and marijuana. Mescaline, which has been used by American Indians in religious ceremonies, comes from the peyote cactus. Psilocybin, also used by the Indians and believed to have supernatural powers, is found in about 20 varieties of mushrooms. Once ingested, psilocybin is converted to psilocin, which is responsible for the drug's hallucinogenic sensations. DMT (dimethyltryptamine) is a short-acting hallucinogen found in the see....

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