U.S. researchers exploring simulated driving performance among regular cannabis smokers saw reduced skills behind the wheel, but “indistinguishable” performance at 4.5 hours compared to those taking a placebo.
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Acknowledging that regular users who smoked when and how much they felt like “resulted in simulated driving decrements. However, when experienced users control their own intake, driving impairment cannot be inferred based on the THC content of the cigarette, behavioural tolerance or THC blood concentrations,” authors write in the study, published this week in JAMA Psychiatry.
Even so, investigators from multiple U.S. caution that users may perceive that their impairment has ended before it has. Subjects were
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