The annual cannabis holiday and fatal traffic crashes

Cannabis use has been linked to impaired driving and fatal accidents. Prior evidence suggests the potential for population-wide effects of the annual cannabis celebration on April 20th ('4/20'), but evidence to date is limited.We used data from the Fatal Analysis Reporting System for the years 1975-2016 to estimate the impact of '4/20' on drivers involved in fatal traffic crashes occurring between 16:20 and 23:59 hours in the USA. We compared...