Warm skin, excessive perspiration and body odor. Hallucinogenic drugs, which occur both naturally and in synthetic form, distort or disturb sensory input, sometimes to a great degree.
Hallucinogens occur naturally in primarily two forms, peyote cactus and psilocybin mushrooms .
Several chemical varieties have been synthesized, most notably LSD , MDA , STP , and PCP . Hallucinogen usage reached a peak in the United States in the late 1960's, but declined shortly thereafter due to a broader awareness of the detrimental effects of usage. However, a disturbing trend indicating a resurgence in hallucinogen usage by high-school and college age persons nationwide has been acknowledged by law enforcement. With the exception of PCP , all hallucinogens seem to share common effects of use. Any portion of sensory perceptions may be altered to varying degrees.