I agree with a lot of what has been said above. Sorry, but I don't have a useful contribution I just wanted to say thanks for asking this question. After our baby is born the three of us are moving to the UK and until our stuff arrives from Australia we will be living with my DH's parents. FIL and BIL both smoke and I have been really worried about how to handle this issue, this has been a really helpful thread even though the situation isn't quite the same!