You cannot eliminate your scent, but you can minimize it. Simply put, if you minimize your scent....including cover it up with natural methods like smoke (where appropriate), the deer will still be able to smell "man" somewhere in that scent cone, but they may not realize you are only 20 yards away. Your masked scent may give the impression you are further away, therefore they don't go on alert....yet.
Deer don't bolt every time they smell man-scent. If they did, they would spend all there time running around in a panic.
They smell, analyze, and react accordingly. With a PROPERLY masked scent, you can fool them for a few minutes, maybe long enough to get one to walk through your scent trail and present a shot.