When and why did the scientific study of LSD and other hallucinogens decline?
Answer: In 1974 a report by the National Institute of Mental Health (NIMH) stated that their research had contributed little to the understanding of the "bizarre and potent effects of this drug" and consequently it stopped its in-house research as well as stopped funding university human research. In 1975 the National Cancer Institute and the National Institute of Alcohol Abuse and Alcoholism stopped supporting research. Since then only animal studies have continued to better understand the mechanism of action at a neural level.
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