A British study discounts a link between occasional cannabis smoking or other light illicit drug use and the decline in mental functions that comes with middle age. The study, carried in the American Journal of Epidemiology, tested the mental function and memory of nearly 9,000 Britons at age 50 and found that those who had used illegal drugs as recently as in their 40s did just as well on the tests as peers who had never used drugs—or slightly better.
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