It doesn’t work that way. Organized crime (including the old Mafia) is still involved in alcohol sales and as silent partners in night clubs; they even smuggle cigarettes.
My years of working with convicts convinced me that addicts don’t commit crimes to support their drug habits, criminals use and abuse drugs as part of their criminal lifestyle.
On the other claw, most criminals who heavily abuse drugs die young, like before they are 35. Maybe we could allow unrestricted access to and use of drugs as a way to reduce the anti-social part of the population. Think of it as evolution in action.
How much money do they pull in?