This classification includes a wide variety of substances with myriad effects. Humans have used them for tens of thousands of years for religious, social, ceremonial and medical purposes. We will focus on only a few of the substances in this category as most (excluding Cannabis) are used in statistically less significant numbers and cause less harm than the other classifications of substances.
Hallucinogens cause people to have experiences that are different from their ordinary reality. The conscious mind becomes aware of things that it normally is not aware of. Hallucinations can range from mild distortions of the senses to an intense experience where one believes a vision or other altered perception is real and is unaware it is the effect of the drug.
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