I try to breath through my nose. I also don't eat any meat between the time I brush and floss my teeth and when I hunt. I figure the smell of rotting flesh in someone's/something's mouth has got to be an alarming predator scent to a deer. I am tryign gumoflage this year for the first time. We'll see. I will say I haven't gotten busted by scent (that I know of) in 2 years. I'm kinda fanatical about scent control. I dress in the woods, etc. I'm in agreement that deer have changed. From what I understand, 20 or 30 years ago, deer didn't look up in tress. They do now.