The federal government’s war on drugs gets plenty of ammunition from scientific studies that have correlated the use of such substances to various psychological problems. Conspicuously absent, however, are data showing that marijuana, one of the most widely used illicit drugs, causes mental or behavioral problems in teenagers and young adults, a new report concludes.
The causal chain of events could just as easily run in the opposite direction, suggest psychologist John Macleod of the University of Birmingham in England and his colleagues in the May 15 Lancet.
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