States With Medical Marijuana Laws Have Fewer Traffic Fatalities, But Why Isn’t Clear

(Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)

States that passed medical marijuana laws have seen an 11% reduction in traffic fatalities on average, according to a new study published in the American Journal of Public Health. Compared to states without medical marijuana laws, those with them had 26% fewer traffic fatalities overall. Study data was collected between 1985 and 2014.

The impact was greatest for the 25 to 44 age group, which is also the group with the highest percentage of alcohol-related traffic fatalities. In 2013, about 47% of fatally injured drivers with blood alcohol levels over the legal limit more at