Does Cannabis Significantly increase the risk of Traffic Accidents. No.

Monday, 21 January 2019

“The increased crash risk associated with THC-positive drivers in a large number of (meta-analysis) culpability studies show. Risk of being involved in or cause of traffic accident while using alcohol and many prescription drugs are not low.”

-       Dr. David Hepburn


Culpability studies, a common study design in the cannabis crash risk literature, typically report odds-ratios (OR) indicating the raised risks of a culpable accident. This parameter is of unclear policy relevance, and is frequently misinterpreted as an estimate of the increased crash risk, a practice that introduces a substantial "interpretational bias".

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VIsitDr. Dave Hepburn website:


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