David and I have helped family out, and laid down ground rules the moment they stepped in the door. We made it very clear, and stuck to it. I'm sorry you're having to deal with all those things, the cigarette thing would have to change for me, even if there are only a couple weeks left! Everyone should have someone like you in their lives. I've been helped out before in such a way, and believe me, I did everything I could not to disrupt my friend's routine, privacy, etc. Obviously, that can't be avoided entirely, but it can surely be attempted! Not to mention, I kept the disgusting apartment cleaner than it had ever been prior to me living there. You'll be back to normal soon!