A study of drivers who died due to car crashes finds that about 42% of them showed signs of recent use of marijuana and THC, with a mean THC level of 30.7 ng/ml, about six times the legal limit in Colorado. Compare this with only 15% of Americans using cannabis in any form, and it would seem that we are starting to see significant evidence that THC indeed impairs safe driving. The next step, in my view, is to see what percentage of those fatalities also included alcohol or other drugs, and to determine what portion of users use THC at this level.
I write this as someone who is generally friendly to the notion that marijuana is nowhere near as dangerous as opioids, and I stay by that view, but we simultaneously ought to realize that the use of THC, a mild hallucinogen, will not be without consequences.
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