So it is only adults who have the right to make their own choice. That's fine.
You talked about alcohol. Alcohol is a great case study, I would suggest, in the argument against abolishing prohibition, and I'll tell you why. Alcohol has been legal for almost a century, and organized crime still exists and abuse of alcohol is at higher levels today than it ever was. With that as background, why do you think abolishing prohibition of marijuana would be a successful policy?