Increased collision risk among drivers who report driving after using alcohol and after using cannabis (letter to the editor)

Reproduced with permission of the Canadian Public Health Association.Alcohol and cannabis are the two most commonly used psychoactive drugs in Canada: about 80% of adults consume alcohol, while nearly half report trying cannabis in their lifetime. It has long been known that driving under the influence of alcohol (DUIA) increases collision risk, and more recent evidence suggests that driving under the influence of cannabis (DUIC) does as well. Little research exists on the prevalence of people who report both DUIA and DUIC, or on collisions experienced by this group. Described here is the self-reported collision risk among drivers who report DUIA and DUIC in the Ontario adult population. Though these data cannot distinguish whether these behaviours occur concurrently, population data such as these can be useful in assessing the health risks facing individuals who report these behaviours