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Hallucinogens are among the oldest known group of drugs used for their ability to alter human perception and mood. For centuries, many of the naturally occurring hallucinogens found in plants and fungi have been used for a variety of shamanistic practices. In more recent years, a number of synthetic hallucinogens have been produced, some of which are much more potent than their naturally occurring counterparts.

The biochemical, pharmacological, and physiological basis for hallucinogenic activity is not well understood. Even the name for this class of drugs is not ideal, since hallucinogens do not always produce Hallucinations.

However, taken in non-toxic dosages, these substances produce changes in perception, thought, and mood. Physiological effects include elevated heart rate, increased blood pressure, and dilated pupils. Sensory effects include perceptual distortions that vary with dose, setting, and mood. Psychic effects include disorders of thought associated with time and space. Time may appear to stand still and forms and colors seem to change and take on new significance. This experience may be either pleasurable or extremely frightening. It needs to be stressed that the effects of hallucinogens are unpredictable each time they are used.

Weeks or even months after some hallucinogens have been taken, the user may experience flashbacks--fragmentary recurrences of certain aspects of the Drug experience in the absence of actually taking the drug. The occurrence of a flashback is unpredictable, but is more likely to occur during times of stress and seem to occur more frequently in younger individuals. With time, these episodes diminish and become less intense.

The abuse of hallucinogens in the United States received much public attention in the 1960s and 1970s. A subsequent decline in their use in the 1980s may be attributed to real or perceived hazards associated with taking these drugs. However, a resurgence of the use of hallucinogens in the 1990s is cause for concern. By 1999, one out of every six college students (14.8 percent) reported some use of hallucinogens in their lifetime, and an estimated 900,000 Americans 12 years of age or older, were current users of hallucinogens. Hallucinogenic mushrooms, LSD, and MDMA are popular among junior and senior high school students who use hallucinogens.

There is a considerable body of literature that links the use of some of the hallucinogenic substances to neuronal damage in animals, and recent data support that some hallucinogens are neurotoxic to humans. However, the most common danger of hallucinogen use is impaired judgment that often leads to rash decisions and accidents.

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Definitions of Terms Used

Drug Any substance, other than food, that changes the function or structure of the body or mind when ingested. Drugs essentially are poisons. The degree they are taken determines the effect. A small amount acts as a stimulant. A greater amount acts as a sedative. A larger amount acts as a poison and can kill one dead. This is true of any drug. Each has a different amount at which it gives those results. 
Hallucinations Perceptions of something (such as a visual image or a sound) that does not really exist. Hallucinations usually arise from a disorder of the nervous system or in response to drugs (such as LSD). 

A diverse group of drugs that alter 
perceptions, thoughts and feelings. Hallucinogens do not always produce 
hallucinations. These drugs include LSD, mescaline, MDMA (ecstasy), PCP, and 
psilocybin (magic mushrooms).

LSD An hallucinogenic drug that acts on the serotonin receptor. 

Information courtesy DEA




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