Weed impairs driving skills long after the high is gone

Despite having no THC in their system, heavy users consistently performed worse on driving tasks than non-users, making critical, dangerous mistakes, a new study found.

Running red lights. Driving at high speeds. Crossing center lines into the opposite lanes. Getting into accidents -- even hitting pedestrians. A new study found these were some of the dangerous driving behaviors of regular, heavy users of recreational weed who began using before the age of 16.

Here's the catch: users drove this badly even when they were no longer high. The study, published Tuesday in the journal Drug and Alcohol Dependence, asked chronic, heavy marijuana users to drive in a customized driving simulator.

"We've documented the role of impulsivity in cannabis users previously, and it does appear that earlier onset may confer a decreased ability to inhibit inappropriate responses," Gruber said, adding that science doesn't completely understand the relationship.

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