Study: Heavy pot smoking shrinks gray matter

November 12, 2014 7:03 AM

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Longtime, chronic marijuana use causes significant abnormalities in brain function and structure – and perhaps lower IQ – according to a major new study conducted in part at the Mind Research Network on the campus of the University of New Mexico.

Chronic users tend to have a smaller volume of gray matter in a part of the brain associated with decision making and addiction and a marked increase in a function called brain connectivity, which researchers said may be an attempt by the brain to make up for the decreased gray matter volume.

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