There is nothing just YOU can do. It sucks but really the only way to deal with that is rehab, and even that doesn't work long-term in a lot of cases.

A rehab psychologist would probably tell you that the best way to avoid falling off the wagon and relapsing is by simply avoiding places and individuals who indulge in these things. In other words, no more house parties, no more hanging out with friends who may or may not be able to handle it recreationally... you either have to find new friends/hobbies/etc or you will fall back into the pit time and time again.

People like to throw shit at AA nowadays (some of it deserved), but there's a reason those people become "addicted" to AA and only want to hang out with others from AA, because that's the best way to stop yourself from being a hopeless, penniless addict who your family hopes doesn't show up to any family events and generally ruining your life outside of your own short-term immediate enjoyment. But yeah, not a lot of people are willing to do that, hang out with the same people as soon as they get out of rehab and end up in the same place.

Have a cute picture.

This thread made me so fucking incredibly sad.

I'm also really high right now.

the only help you can provide is to be there when he asks for help. trying to tell him what to do or force his actions (slapping a joint out of his mouth for example) will not help anyone.

I feel like you may be overreacting. If he is trying to get off of hard drugs I understand and perhaps he shouldn't be going to house parties until he's got a better handle, but you physically preventing him from smoking a puff of weed after a party is just going to make things worse. I can see how that will generally piss him off.

Be a friend to him if he wants it, but he is not your responsibility nor your child to scold.

I think you should mostly just let him do what he wants. Don't fight his battles for him.

If you are intent on helping though, you can only really help in preparation. In your anecdote, making an idiot out of yourself when he tries to smoke weed isn't going to help. Help him prepare and train against temptation, but when he is face to face with his demons he has to fight them alone.

Or you could feed him LSD and guide him through a terrifying and climactic spiritual journey. Dramatic fire-and-brimstone yelling and all that. You probably don't have enough shaman powers to do that though.

Smoking weed when you're drunk doesn't count as falling off the wagon. It's only when you are buying weed that you've fallen off.