I stand by what I said - You guys are totally nuts. The breath smell suppressant manufacturers are using the P.T. Barnum philosophy "sucker born every minute". Shoot the deer if they are close enough to smell your breath. He11, you should be able to pet them!
Do you realize how far your scent cone travels with the wind? Would hundreds of yards surprise you?
Your mouth emits WAY more human scent than any other part of your body (unless you're holding your breath for several hours).
There may be some "suckers" out there......but I ain't one of 'em.