Hallucinogens are natural and human-made substances that often cause people to believe they see random colors, patterns, events, and objects that do not exist. The hallucinatory experiences can either be very pleasant or very disturbing. Many different types of substances are classified as hallucinogens because of their capacity to produce such hallucinations. These substances come in the form of pills, powders, liquids, gases, and plants that can be eaten. In the body, hallucinogens stimulate the nervous system. Effects include the dilation...
Source: Encyclopedia of Science, ©2005 Gale Cengage. All Rights Reserved. Full copyright.
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