1. Recreational, like marijuana and alcohol and many hallucinogens, where regulating and taxing is the best solution, to deter organized crime and make sure people are getting the product they want to get
2. Harmful (and the definition is tough here) like meth and heroin, where the goal is something closer to medically supervised use, and breaking the habit where appropriate, but also making sure people are getting real drugs and not resorting to more dangerous alternatives or those of unknown origin.
The point isn't that drugs are good, it's that people will do them anyway, so how do you remove the criminal element and keep people safer under the circumstances. I agree that they shouldn't sell meth at convenience stores, but someone addicted should be able to talk to a doctor and get it, and not have to buy some dangerous unknown thing off the street.
I imagine if this happened, the next fight would be social control advocate groups pushing for currently legal drugs (alcohol) to me moved to my category 2. People's own puritan values and a hatred of the idea that someone else may be enjoying themselves in a way they don't endorse are a (the) main root cause of all the societal problems with drugs imo