Just because he is my son doesn't give me the right to tell him what he can do with his body. I would support him any way I could, but I would not force him to do anything. Criminalising drugs is using force to solve a mental health issue.
I've known people addicted to drugs, btw, mostly legal. I wouldn't ban their drugs either.
Well, hey, if you’re willing to die on that hill, and feed your only child to the machine on principle, then I guess there’s nothing I can say that would change your mind. Personally, I think there is nothing good that can come from recreational heroin or methamphetamine. They are not only hurting themselves - the cost to society is massive. And while they may choose to do it - they can’t choose to stop.
The only machine here is the legal machine that makes criminals out of ordinary people, and makes cops and politicians corrupt.
The cost to society is mostly caused by the criminalisation, not the drugs. And many drug users do stop eventually. Give them access to clean drugs and mental health support and more will.