Many medical marijuana users say they’ve driven high

More than half of people who take medical cannabis for chronic pain say they’ve driven under the influence within two hours of using it at least once in the last six months.

One in five of them said they’d driven while “very high” in the past six months, researchers report.

The results of the survey of 790 Michigan medical cannabis users are troubling, says Erin E. Bonar, assistant professor of psychiatry and a practicing clinical psychologist at University of Michigan Addiction Treatment Services and lead author of the paper, which appears in Drug Alcohol Dependence.

Don’t drive

Hundreds of thousands of Americans have state approval to use medical marijuana, including nearly 270,000 in the state of Michigan, according to Statista, as of May 2018. Michigan is second only to California for the highest number of medical marijuana patients in a state.

Bonar says that when people drive under the influence of

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