States that allow medical marijuana have 25 percent fewer prescription drug overdose deaths, a team of researchers reports in a newly released academic paper, suggesting that expanded access to marijuana, often used for its purported pain-alleviating qualities, could have unintended benefits.
As awareness of the addiction and overdose risks associated with opioids grows, “individuals with chronic pain and their medical providers may be opting to treat pain entirely or in part with medical marijuana,” said Colleen Barry, an associate professor at the Johns Hopkins Bloomberg School of Public Health and senior author of the study.
The researchers found that states with medical marijuana laws consistently had lower overdose death rates throughout the years studied — 1999 to 2010 — and that such laws were associated with a 24.8 percent lower annual rate of painkiller overdose deaths. Those states had 1,729 fewer overdose deaths in 2010 than would have been predicted by trends in states without such laws.
To conduct their analysis, published Monday in the peer-reviewed JAMA Internal Medicine, the researchers relied on Centers for Disease Control and Prevention death certificate data. The rate of overdose deaths rose in all states over the study period. California, Oregon and Washington were the only three states with medical marijuana laws in place before 1999, while 10 more had joined by 2010.