OF course there are. Alcohol takes time to impair, pot is instantaneous. DUH!

From The Journal News
New York recreational marijuana legalization: What to know about drugged driving
Drugged driving concerns are key to New York recreational marijuana debate as research indicates crashes are up in states that already legalized pot

https://www.lohud.com/story/news/crime/2019/02/25/new-york-recreational-marijuana-what-know-drugged-driving-cannabis/2927179002/?#_=_