I think scent control is a huge factor just like the wind. During archery season I go a little overboard with my gear as well as truck. If the wind isn't right then I think it is time to move to another location so that the wind is in your favor. There sense of smell is often greater than our eyesight through the trees and just because you haven't seen a deer wind you doesn't mean he didn't wind you way before you can see him. Plus, I think does and immature bucks are a little less uneasy about scent than the big boys are and thats maybe why they get a little closer and make you wonder about the importance of scent, but I think the big one might take the long way around a stand that has scent contamination.

JMO