"but pot smokers eat all the rice crispy treats and drive soooo fast"
Based upon the stoners I've known in years past, you're right on the money with the rice crispy treats, but drive fast? Nope, it's very, very careful, with the perfect tunes on, and dead on the speed limit. Too paranoid to go either too fast or too slow. Just don't let them get distracted (which happens very easily).
Sounds like we know the same people! One of my friends gets so paranoid you can't even talk to him.
I'd rather be in a car with a pot smoker than a person who is drunk. It's safer.