Driver smoking medical cannabis. When people drive under the influence of marijuana their reaction time and coordination may be slowed down and they could have a harder time reacting to the unexpected. (Photo: iStock)

More than half of people who take medical cannabis for chronic pain say they have driven under the influence of cannabis within two hours of using it at least once in the last six months, according to a new study.

One in five said they had driven while "very high" in the past six months, researchers from the University of Michigan Addiction Center reported in a new paper in the journal Drug & Alcohol Dependence.

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Steven A. Meyerowitz

Steven A. Meyerowitz, a Harvard Law School graduate, is the founder and president of Meyerowitz Communications Inc., a law firm marketing communications consulting company. He may be contacted at [email protected].