I recently just took up MJ for migraines. Seeing as I only smoke at home and I generally am more fluent around my wife, I haven't had the adverse speech effects yet (or I have, but they don't matter as much at home). As far as the social awkwardness, that takes practice more than anything. Being out is good. Even if you can't talk to a girl, or anybody else, being around people will help with your state of mind. Above all else, remember that what you have to say is just as important at what they have to say. If they can't afford you the time to listen, then what you have to say will be wasted on them. Stay strong, and stutter on.