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The effects of LSD are believed to occur as a result of alterations in the serotonin system. As little as 20 micrograms can produce an effect. In pure form, LSD is clear or white in color, has no smell, and is crystalline. It breaks down with exposure to ultraviolet light.[13]
About 10 percent of people in the United States have used LSD at some point in their lives as of 2017, while 0.7 percent have used it in the last year.