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NIDA Notes Articles: Teens
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Early-Onset, Regular Cannabis Use Is Linked to IQ Decline

August 2013

Regular cannabis use that starts in adolescence strips away IQ, a NIDA-supported study suggests. Participants who initiated weekly cannabis use before age 18 dropped IQ points in proportion to how long they persisted in using the drug. Persistent cannabis users’ cognitive difficulties were evident to friends and family and measurable on a battery of tests.

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