If you have the wind in your favor it won't matter. However, on those marginal days, real still, swirling winds, etc. it could definitely get you busted.

Think about this. As a non smoker, I can immediately smell if someone is smoking when I walk into a room or building, but I can't smell if people are in there or not. I can also pick up the cigarette smoke odor off of an individual when they walk into a smoke free environment, but I can't smell the person.

There is no debate that deer can smell a whole lot better than us, so it's obvious that they are going to detect a smoker or cigarette smoke very easy, and probably before they smell human scent, as cigarette odor is much stronger.