People using a driving simulator showed no signs of impairment a day after they smoked cannabis, though they still tested positive for THC, its main psychoactive component, a recently-published paper says.
The research has implications for laws and workplace rules that require no trace of THC, which Scott Macdonald, a retired professor at the University of Victoria, calls “not scientific.”
“I consider it one of the biggest myths about cannabis, that there are 24-hour hangover effects that are measurable,” he said. “When people smoke cannabis, they’re only impaired for a short, short period of time. You could have THC in your bloodstream, but you’re not a danger.”
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