Oh my goodness... That sounds so overwhelming!!!! I've never spoken with you before but *hug*.
Living with someone who is quitting the cigs can be wretched. I'm going to share something I've heard Al-Anon people say which is, This addiction: you didn't cause it, you can't cure it... Oops I think there's another "C" in there that I'm leaving out.

Oh well. Maybe the Serenity Prayer is what I'm looking for here. No matter how you act or what you say, your man will smoke, or he won't. It's not up to you, it's up to him. And I don't know what your secondary addiction is, but slipping happens... it doesn't make you a bad person.