Does Weed Make You Stupid? Cannabis can mildly affect cognition for up to 72 hours after use. However, research has shown that there are no significant long-term cognitive side effects from weed. This study tells us that marijuana does NOT make you stupid. A systematic review, published in JAMA Psychiatry, analyzed 69 different studies all of which examined marijuana’s effects on cognition, including learning, memory, speed of information processing, and language and motor skills. The research was conducted at the University of Pennsylvania and included 2152 self-reported cannabis users and 6575 self-reported non-cannabis users. The study found that cannabis use slightly
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