Middle-aged adults whose memories have grown hazy can’t blame occasional pot smoking or other light illicit drug use for their forgetfulness, according to a British study, although experts warn heavy, prolonged use could harm mental functions. 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, or slightly better, on the tests than peers who had never used drugs.
