No cover scent and blowing cigarette smoke out the window at them and it doesnt seem to bother them.
This isn't a true test of the Whitetails ability to smell danger. Although I don't smoke anymore,one of the largest Whitetails I've evr encountered was while Squirrell hunting and I was smoking a cigarrette. He came with 15 yards. He didn't ever smell cigarrette smoke before and didn't associte it with danger. However their vision and hearing are superb as well.