I think most of the people who want to smoke pot already do. I don't know what will or won't change as far as employment based drug testing, even with legalization, which would be one of the biggest factors keeping people who might want to use pot away from doing so.
I think the best thing will be that it will not be an excuse for police to interfere with you as you're going about your business, but I'm sure they'll find new ways to wedge themselves into the lives of poor people and minorities.
I would hope that anyone incarcerated solely on marijuana related charges would be released.
Smoking a bud, drinking a cold microbrew... in a hot (and full) bath... ****s gettin real.