Hello. I’m sorry to hear you are dealing with this. My brother also abused drugs in his twenties. Many many LSD trips. He is now past 60, and he does have insight enough to be able to say he used to have a severe substance abuse problem.
I’m wondering how the doctors are able to say your son is mentally stable when he has both schizophrenia and is abusing substances.
I think the addictive mindset will always linger but I have seen that it can be overcome and the insight will arise. My brother, after a suicide attempt and rehabs, eventually shifted his focus to cigarettes–a pretty common addiction for those who suffer from MI–but he quit smoking after my mom relentlessly badgered him and is now pretty obsessive about nicotine gum. And vitamins/supplements. His sobriety, if you can call it that, is a point of pride and strength now and he will preach it to anyone who will listen. It’s been a long battle though. Hard to watch. I wish you well.