It still sounds like you think of a 'typical drug user' as an addict. I think the point was that a good portion of drugs are consumed by fairly responsible, recreational users.
I've encountered many types of drug users in my lifetime. Several years ago we let my brother in law live with us for 6 months because he was homeless and trying to get off of heroin. He started doing hard drugs as a young teenager because his adopted parents were abusive drug addicts. We watched him regain his health only to have him get addicted to pain medication just a few months after he moved away.
On the other side of the spectrum, I've run into people who have used drugs for 30-40 years for recreational purposes, while enjoying a happy marriage, successful kids, and a steady job.
Don't buy the drugs and you starve the cartels. You don't have to wait for legalization to have a direct if small impact on murder and torture. Sure, campaign for legalization, but you can take direct action this minute.