Marijuana May Hurt Cognitive Function, Worse with Heavier Use

The Carlat Psychiatry Report, Volume 10, Number 10, October 2012

Glen Spielmans, PhD

Associate professor of psychology, Metropolitan State University, St. Paul, MN

Glen Spielmans, PhD, has disclosed that he has no relevant financial or other interests in any commercial companies pertaining to this educational activity.

Does marijuana affect cognitive function? There seems to be no shortage of opinions on this question, but no prospective, longitudinal study has ever been published. Until now, that is.

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