All books are currently in a non-smoking home. However, I get all of my books from garage sales, book sales, etc. so I do not know where they were before that. I am always interested in doing larger BOBs (6 or more books), but I'm willing to swap as few as two books. Note: Some books are ex-library books (usually not the historicals) so feel free to ask about a particular book. Sorry, hardbacks are limited to one per BOB.