I was asking the OP, for a specific reason.
And just in general, what makes anyone think the illegal drug trade business would go away?
Price and/or profit would be the first reason. Right now it's banned and/or illegal, therefore it's simply supply and demand or basic free market principles at work.
A limited supply (what can be smuggled in) and a large demand by the public makes for a very high value, hence high profit.
The fight, or killing, is who gets the monopoly over that market and who reaps the benefit of that monopoly.
Remove the illegality of it and anyone can now supply the market, no more monopoly and/or high price. No more massive profits and the cartels lose thier source of money.
Anyone who wishes to sell alcohol can do so, get the permits or whatever is needed, crank up your still and do your thing.
No monopoly is created by the existence of various laws banning it. The gang wars of the `30's were over the very same thing as are the current drug gang wars, who will get the monopoly over the commodity and the massive profits from it. In the `30's it was over alcohol, now it's drugs. Soon as the ban on alcohol was lifted, did the gang wars continue over the production and illicit sale of alcohol? Moonshine does not count as an example, that is an effort to avoid taxes, not a fight over a monopoly of profit.