However I suspect the drug dealers won’t just disappear, but move on to other substances. Hopefully the market for those will be smaller but I have no idea. Thinking of synthetic drugs.
And for the most part, synthetic drugs are a reaction to prohibition, either to stay ahead of substances that have been scheduled as illegal or to provide drugs that can be made in-region to avoid the risk of smuggling. There is little organic demand for such drugs, and it would be much safer if people had access to pure forms of their drug of choice, i.e. cocaine and heroin
We really need to be able to explore these compounds and their pharmacodynamics, they can teach us so much about the brain