I'd have no problem with this as long as it's properly regulated, and as others have said, the tax revenues would be a definite positive.
And if we're being honest, I doubt there are many on here, (although, of course, there are some who didn't "partake", and that's perfectly fine), who didn't share a joint on occasion when you were with your buds. -And while my personal experience with that wasn't in any way extensive, I never felt compelled to do more, nor did I see any hint of addiction in the guys in my group who indulged in a larger way than me. In fact, when that era, (if you want to call it that), had essentially run its course, we dropped using it completely with no issues at all.
Cigarettes, on the other hand...well, I've never been a smoker, but some of the guys I knew back in the day who began smoking "coffin nails" in their teens are still trying to kick that particular "habit".