Marijuana is a generally harmless intoxicant that produces serious psychological effects only in users who are emotionally disturbed to begin with. So. at least, runs the prevailing view, held by potheads and professional researchers alike. Last week, a challenge to that idea came from two Philadelphia psychiatrists who believe that regular pot smoking can cause grave psychiatric ills, including psychosis, even in young people who previously were stable.
Writing in the Journal of the American Medical Association, Dr. Harold Kolansky and Dr. William T. Moore reported that all 38 patients in their study were adversely affected by smoking pot. Of eight who...
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