Even decriminalization has gone a long way toward easing the burden on MA authorities. I occasionally catch a whiff of the stuff on the street, but you don't have people going around smoking huge blunts on the street, either. The potheads are still potheads, the straightedges are still straightedges, it's just that fewer of the former are in jail needlessly now.
What they really need to do is legalize it and tax it like they do cigs. Might wanna stock up on veggies and fruit and dips right next to the Mary Jane, though, otherwise we might have to worry a lot more about that obesity thing.