Sure, it probably made me a better driver as demonstrated no 5th gear. I was far more concious of everything going on. Would I recommend it, no, I don't think people should do it, but to compare it to drink driving as if it is as bad is just silly, id probably put it on par with someone driving who had had a bit too much coffee.
Tiredness, Alcohol, forms of mobile phone usage and poor driving skills are dangerous, I would not put what I experienced personally any where near those things. Maybe some people have much different reactions to smoking the stuff, I know I haven't done in over 3 years now because I stopped enjoying it.