I 100% agree with 2much. Sure, some people use MJ for medical purposes...pain control, migraines, to help with appetite...and that's fine by me. I could say that I smoked because of the migraines I've had since high school (which I do) but that's definitely not my only reason. I smoke to get high. But it shouldn't matter either way. I think that after a legal age it should be up to an individual to decide if they want to smoke MJ, just like with Alcohol and Tobacco, neither of which I use.
I'm not in a legalized state so even if I did need it for medical reasons I couldn't get it.
(Sidenote: Not to be insensitive, but I wonder how many people fake medical conditions to get medicinal MJ. Most people who are rooting for legalization in my neck of the woods don't even have a medical condition that would require MJ. They just want to get high too.)