Cannabis use doubles chances of vehicle crash according to a new article in the British Medical Journal.
The paper reviewed nine studies with a total sample of 49,411 people to determine whether the consumption of cannabis increases the risk of a motor vehicle collision. This is the first review to look at various observational studies concerned with the risk of vehicle collision after the consumption of cannabis. Previous studies have failed to separate the effects of alcohol and other substances from the use of cannabis, resulting in a lack of agreement.