I don't have any advice that I can give, but just wanted to let you know that I can sympathize. We live in a co-op and our downstairs neighbor smokes on the front stoop, which in turn comes up through our windows. Annoying? Yes, but unfortunately, there is nothing that can be done. He is smoking outside, it's his house, and sucks to say it, but it's just one of the side effects that comes from co-op living. I am counting the minutes until we can sell this place and FINALLY get a house!