Hallucinogens are a diverse group of drugs that alter perception (awareness of surrounding objects and conditions), thoughts, and feelings. They cause hallucinations, or sensations and images that seem real though they are not. Hallucinogens can be found in some plants and mushrooms (or their extracts) or can be made by humans. People have used hallucinogens for centuries, mostly for religious rituals.
Source: National Institute on Drug Abuse; National Institutes of Health; U.S. Department of Health and Human Services
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