If they can smell the chew, if they can smell the smoke, if they can smell the Taco Johns that you had the night before, then they smell YOU. The wind doesn't seperate odors to different areas. Keep the wind going the direction that you don't expect the deer to be and you'll be fine.

True story: Last week the wind was coming out of the east. Blowing straight west. When it was time to get down I decided to have a smoke 1st. As I'm putting it out in a spitpile in the tree, 2 does come from the northeast of me not more than 5 yards away. They didn't give me a shot, but then again they never knew I was there.