BMJ  2005;331 (10 December), doi:10.1136/bmj.331.7529.0-d

Cannabis increases the risk of car crashes

Driving under the influence of cannabis increases the risk of having a fatal car crash. In a population based case-control study in France (p 1371), Laumon and colleagues estimated that nearly 3% of drivers use cannabis and they are more than three times as likely to be held responsible for a fatal car crash as drivers who don't use cannabis. Cannabis use and alcohol use were similar among the French drivers (2.9% and 2.7%, respectively), but alcohol seems to be causing significantly more fatal crashes than cannabis (28.6% v 2.5%).

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Relevant Article

Cannabis intoxication and fatal road crashes in France: population based case-control study

Bernard Laumon, Blandine Gadegbeku, Jean-Louis Martin, Marie-Berthe Biecheler, and the SAM Group
BMJ 2005 331: 1371. [Abstract] [Full Text] [PDF]