Some people simply switch to the safer drug. DUH
https://www.washingtonpost.com/news/wonk/wp/2017/10/16/legal-marijuana-is-saving-lives-in-colorado-study-finds/?utm_term=.d1795c365ca6
https://www.washingtonpost.com/news/wonk/wp/2017/10/16/legal-marijuana-is-saving-lives-in-colorado-study-finds/?utm_term=.d1795c365ca6