How to get my friend to stop using drugs,drinking,smoking?

You know what is interesting? heresjohnny said a lot and you some how got that you should give up on him. He didnt even say that. Makes me wonder if people have said that to you before. But you stubbornly hold onto the fact that he’s going to change and you’re going to save him. You’re not going to save him. He was not unfortunately kicked out of rehab. He did something that broke the rules and so he got kicked out. Ever heard of enabling? It means making excuses for the person to continue doing their behaviors. He is not becoming an alcoholic. He’s already a drug addict. He may be shifting from one drug to another, but bottom line is that he’s a drug addict (alcohol is a drug). You cannot save him. Your love cannot save him. You needing him cannot save him. Because he needs the drugs more than he needs you. He loves the drugs more than he needs you. And all you are doing by making excuses for him is making it worse. I’m not saying you should give up on him. But you need to learn about addiction to get it. Because if you think that anything you do is going to make him stop, you’re deluding yourself.

‘but he would never hurt me in any way’

uhm you mean except for abusing drugs and alcohol and fighting with you about it?

He’s in denial about his problems. But you’re in far worse denial about him. And the problem with that is, until you accept reality, you’re just contributing to his drug problem.