Matthew Johnson, an associate professor of psychiatry at Johns Hopkins and the lead author of the study, was interested in psilocybin because of the success researchers had in using LSD to treat alcoholics in the 1960s. He liked that psilocybin was shorter-acting than LSD and had less societal stigma. It also has few side effects or addictive properties of its own. Studies have already shown that hallucinogens might relieve everything from clinical depression to anxiety among cancer patients. Smoking, meanwhile, is relatively easy to study—not as deadly as, say, heroin and readily detectable with a urine test.
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