Hi, Reddit! Our analysis of data from the National Highway Traffic Safety Administration found that states saw 11 percent fewer traffic fatalities, on average, after enacting medical marijuana laws, and 26 percent fewer fatalities than states without the laws—even after accounting for differences between states with regard to laws on cellphones and texting while driving, seatbelts, and a variety of other factors. We found reductions in fatalities were greatest in people aged 25 to 44, a group representing a large portion of those registered to use medical marijuana. One explanation for our findings might be that states that legalized medical marijuana have seen reductions in drunk driving, in part because some people are substituting marijuana for alcohol. Our findings are published in the American Journal of Public Health.

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