Hallucinogens are a group of psychoactive substances that alter perception, mood, and various cognitive processes. Unlike other psychoactive substances (such as alcohol, stimulants and opioids), hallucinogens do not merely amplify or dull existing states of consciousness, but instead produce qualitatively different states in which the environment and self are perceived in a new fashion. Hallucinogens are commonly reported to facilitate self-understanding and self-discovery. Hallucinogenic experiences are often compared to non-ordinary forms of consciousness such as lucid dreaming, meditation, religious, mystical or transpersonal experiences, hallucinations, dreams and states of psychosis.
List of hallucinogens