“I read about auto accidents going way up in Colorado after it was legalized there.”
I think you may have read some nanny-statist disinformation.
“Three years after recreational marijuana legalization, changes in motor vehicle crash fatality rates for Washington and Colorado were not statistically different from those in similar states without recreational marijuana legalization.”
- Aydelotte, Jayson D et al. “Crash Fatality Rates After Recreational Marijuana Legalization in Washington and Colorado.” American journal of public health vol. 107,8 (2017): 1329-1331 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5508149/