Teenagers who use marijuana heavily grow up to have poor memories and also have brain abnormalities, a new study shows.

The study cannot say which came first — the brain structure differences or the pot use. But it suggests there could be long-term effects of heavy marijuana use.

A team at Northwestern University looked at 97 volunteers with and without mental illness. The dope smokers said they’d used marijuana daily starting at age 16 or 17, and said they had not used other drugs.

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