Oh boy, the "pot" question. :-) This comes up more often than I would have believed.
Presently, there is a nightmare patchwork of conflicting laws on the medical use of pot. Just because some state has legalized it doesn't mean it's really legal. For example, despite the fact that Michigan is on the list of states where medical marijuana is legal, don't try to come here for it. Local law enforcement has managed to make it almost impossible.
And then there is the health question. Do you really think that marijuana smoke is better for you than tobacco? The active ingredient is different, but there's a lot more in that smoke.
But, yes, some people report that it helps. Still, there are other treatments that you can get that don't involve playing fast and loose with the law. I think I'd try to stick with the legal remedies.