Its already readily available. The only difference is that a lot of people die to make it available. People who want to get high will find a way, be it by purchasing illegal drugs, huffing glue, or drinking legal alcohol.

Now imagine if we took all the money we dump into stopping people from getting high, and put it into helping people with addiction issues. Not saying it would work, but it seems like a good thing to try given that the current approach is a failure