If I may ...
There are approximately 88000 deaths attributed to alcohol in the US every year.
Before I comment, I might want to add, I had a niece killed in an accident where kids were drinking. I have no illusion that drinking while driving, even with legal amounts of alcohol is not dangerous. I have reported FRIENDS to the police for driving drunk, because I'd rather see them in jail than in the ground.
But that number is bogus, and that is why the term "alcohol-related" is used, rather than "drunk driver", because in a traffic fatality, the term is used very loosely. It can refer to victims who were not at fault; it can refer to PASSENGER victims in a car hit by someone NOT under the influence of alcohol. Wherever you see this vague term, check out the data, because you're not getting the whole story.
The actual numbers are far less, even though they're still very high.
THAT said ---
Many, many years ago I used to smoke dope, and it's true, it doesn't make you the slightest bit violent. It did make me a little paranoid. But I can easily attest to the fact that it made several friends of mine completely oblivious to obvious danger, such as the numerous times we have to grab one of our group from continually wandering into oncoming traffic - as a PEDESTRIAN. Or to help one of our group after he fell down a flight of stairs he didn't know was there.
It's my peculiar belief that these sort of dope-related deaths will climb for no other reason except that while a lot of people smoke weed, they don't do it NEARLY as often as people drink and get drunk, but you're still not a better driver when you're stoned than when you're drunk.