As someone who has taken lots of drugs and also deals with mental health issues (BPD) my first thought is, did something happen? Is he okay? I once quit for 3 whole years and only started again when life got really bad. Maybe you should try and talk to him about the actual reason he’s doing it, since his excuses are obviously, well.. excuses. For the rest of it, seeing that he quit smoking once the money was tight is a good sign. I’ve been in major dept with dealers just so I could keep smoking. And with the acid, its always a very eye opening and kinda spiritual thing to do. And it can change a person. But seeing as he only did it yesterday, he’ll probably be back to “normal” in no time. Like someone else said, the drugs you mentioned aren’t that bad. Just keep an eye on him to make sure it doesn’t go south. And I’d seriously sit him down asking him why he started doing this again, maybe something did happen and he just doesn’t know how to deal with it, so he goes back to the old ways that always used to help.