What are hallucinogens?

Hallucinogens, or psychedelics, are drugs that affect a person’s perceptions, sensations, thinking, emotions, and self-awareness. Hallucinogens include such drugs as LSD, mescaline, psilocybin, and DMT. Some hallucinogens come from natural sources, such as mescaline from the peyote cactus. Others, such as LSD, are synthetic or manufactured. PCP is sometimes considered a hallucinogen because [...]