My bit of experience with "recreational" pot users (illegal here in VA) is that they get dumber. People who consume enough alcohol can get just as dumb, but at that point they have trouble standing. Pot use results in the same amount of dumbness without the physical effects.
Medical pot is pretty much a farce. It is semi-legal here in Virginia which means open season. In DC they give it to kids, and they bring it to school. Not allowed to share of course.