A multi-institution study, led by researchers from the University of Pennsylvania, has shown that states which allow medical use of marijuana are experiencing sharply lower deaths due to opioid overdoses.

The study, published in JAMA Internal Medicine, analyzed a time-series analysis of medical cannabis laws and state-level death certificate data in the United States from 1999 to 2010; all 50 states were included. It examined the rate of deaths caused by opioid overdoses between 1999 and 2010.

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