Have any of you had to balance family members that smoke and baby?

I'm fairly certain that my dad has picked his smoking habit back up since he started traveling a lot for work again. When they come to visit he'll have to wash his hands before he holds the baby, like everyone else, but are there any extra precautions I should take? I've read posts about third-hand smoke, and people asking smokers to change clothing before holding the baby. I also don't want to hurt his feelings! However, I want to take every necessary precaution with baby too.

Have any of you had experience with this?