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While many drugs speed up pr 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 non-existent sensation these drugs are also known as mind-bending drugs. Some hallucinogens come from natural sources, examples of which are mescaline, psilocyhin, DMT and marijuana. Others are made in laboratories. Of all drugs, synthetic and natural, the most powerful is LSD, or lysergic arid diethylamide. Twenty micrograms, an almost infinitesimal amount, is sufficient to produce a hallucinogenic effect. The most pronounced psychological effects induced by hallucinogens are a heightened awareness of colours and patterns together with a slowed perception of time and a distorted body image. Sensations may seem to "cross over", giving the user a sense of "hearing" colours and "seeing" sounds. Users may also slip into a dreamlike state, indifferent to the world around them and forgetful of time and place to such an extent that they may believe it possible to step out of a window or stand in front of a speeding car without harm. Users may feel several different emotions at once or swings wildly from one emotion to another. It is impossible to predict what kind of experience a hallucinogen may produce. Frightening or even panic-producing psychological reactions to LSD and similar drugs are common. Sometimes, taking a hallucinogen leaves the user with serious mental or emotional problems, though it is unclear whether the drug simply unmasks a previously disorder or actually produces it.

One physical danger of taking the type of drugs described in the passage is that the user may ........... .

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