Hallucinogens are pharmacological agents in 3 broad categories: psychedelics, dissociatives, and deliriants. These classes share the power to cause profound changes in sensation, emotion, cognition, and consciousness.
Unlike other psychoactive agents, hallucinogens do not merely alter or amplify sensations, but rather induce experiences that are qualitatively outside the realm of ordinary consciousness. In this regard, hallucinogens can uniquely unlock angels or demons in the psyche. In doing so, these drugs can offer the potential for personal revelations that no other psychoactive substances can. This puts at least some hallucinogens in a psychic league of their own: beyond sheer substance abuse, into a pharmacological tool for exploring the nature of the human experience, and of existence itself. This is especially true of psilocybin.
Unlike most other psychotropic substances, hallucinogens are rarely addictive.