I don't notice it at the time (when at friend's house and his mum usually smokes at the back door with it open).
However in the morning I go to put the clothes back on and I am almost sick. They go straight into the washing basket.
Oh! That gets me as well, smokers take note, smoking out of a window or at a door does not help the smell at all. You still stink the place out and everyone who doesn't smoke can tell what you have been doing...
.