I hear your concern katmom. My difficult child biggest disasters came from him being fed information that difficult child couldn't sort out as what was important and what wasn't his business. It caused great many problems, several times in the 3 yrs he was away.
He took the word of a "friend" over his own common sense. (how much of that he has is still in question)
He has to save himself before he can be a support to anyone else. I hope he doesn't lose sight of his goal.
You know that there is no program in the world that a difficult child goes through smoothly. It's always by the skin of their teeth.
Keep away from the cigs anyhow. It won't make anything better and you will smell better. Hugs.