in states that have legal recreational marijuana use. While its all but impossible to say that its due to marijuana use, it suggests a strong correlation as auto accident rates were declining prior to it being legalized.
https://www.usnews.com/news/nationa...ing-in-states-with-legal-marijuana-study-says
https://www.usnews.com/news/nationa...ing-in-states-with-legal-marijuana-study-says