I know its foolish to be mad because he gets to do whatever he wants.
I read this in your opening post and thought "Damn, he gets to do as he pleases, but what does she get?"
You know he can't control you either, he can't cure you, and he didn't cause your reactions to his addictions. You are free to leave without explanation or justification. You are free to kick him out on his butt without either as well. You can do what you like because you don't like what you've ended up with. Oh sure, there are logistics involved like who's house it is, who makes the income, or who's on the lease. That's all symantics. You can end this if you choose. He is choosing to smoke and drink and you hate both sooo... Want to do something about it? Want a life without this crap?
...and how convenient that he funks up the house and leaves it for you to live in while he's gone for a week. Oh, you'll be cooled off by the time he comes home. He's probably hoping for that.
Send him back like cold soup at a deli. This is obviously not working for you.
Alice