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But the bottom line is that long-term, heavy cannabis use may impair the dopaminergic system, which could have a variety of negative effects on learning and behavior.. You might also like: Young Marijuana Users Show a Unique Response to Social Rejection, Study Finds.
The study adds to previous research suggesting marijuana can lead to people becoming withdrawn, lethargic and apathetic. Psychiatrist Dr Nora Volkow, of the National Institute on Drug Abuse in the U.S., used the stimulant Ritalin to see the effect cannabis had on the brain.