Depends on the smoker to be honest, if his a noobie and can't control his high then i would say its as dangerous as being drunk (not literary but you know what i mean hopefully), but if the stoner does this since he got out of his mothers vagina, then i would say its fine, since some of my friends drive to school and they smoke a lot. They are used to it. It is dangerous both ways tho, its dangerous to drive while being on any type of drugs because your perspectives change on drugs.