So you say the difference is some moral deficiency? ok well why don’t we try and treat that. After all we need pain killers in medicine and we want to make them as safe as possible.
Let’s call junkeyism a disease and see how we can stop it happening. Maybe by understanding if some people respond better or worse to different kinds of drugs, maybe we could identify a test we could do to work out what would be safe for someone?
Like what do you think it means when a doctor calls something a disease? People can make bad decisions and still get diseases. If inject yourself with the blood of everyone you meet you’ll eventually get a few, they don’t stop being a disease just because you gave it to yourself (and also we might ask why someone felt compelled to do something so foolish and could we have helped them).