SOURCES:
A youth’s brain is still under construction until the early 20s. Weed messes with your memory and even the way your brain is shaped.

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Regular marijuana use by youth may contribute to losing 3 to 6 IQ points; heavy and frequent use can lower the IQ by 8 points (the difference between being a manager and having a minimum wage job).  

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Studies link heavy use to lower life satisfaction, poor friendships, and crime. It negatively impacts school achievement, and the chance of getting a good job, earning good money, and having good relationships.