I used to smoke, and for years I never smoked in the woods, and then the last 4-5 years before I quit, I would smoke on stand. I really think that the smoke doesn't spook the deer, but I'm POSITIVE all the motion of moving your are/hand to your mouth the take a drag does bother the deer.

I haven't smoked for 2 years now, and I can't tell a difference in the deer, but I do know that my lung capacity seems WAY BETTER when hiking in/out of the woods each day.