first dont smoke in the house, if it is there house and they pay the bills
then show them respect, if that does not apply then, always have your room

smelling real nice, many ways you can do that I dont need to explain, also
keep your self smelling nice, that way they get use to a certain smell, and

wont think it is stange when all of a sudden they smell like Glade fragranc
or what ever you might be useing, then they might think you are trying to

cover up somthing, so keep things smelling nice even when your out and not
smoking. may not be perfect but it has worked for me at times.