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Cloudy Cognition in Cannabis Smokers

Long-term use of cannabis (marijuana) may lead to cognitive deficits, suggests a large observational study published in the American Journal of Psychiatry in May. Using data from a cohort of more than 1,000 people born in New Zealand in 1972–1973 and followed until age 45, investigators found declines in IQ from childhood (before cannabis use […]

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