LT, I somewhat disagree. All the smells associated together, breath included, hell there are people whose breath I could smell from downwind and I'd run too...
Anyway, are not bird dogs trained to smell the breath/exhale of birds? ? I heard that once, I do not know.
Anyhow, number one I feel is our hair....just smell the inside of any one of your worn baseball hats....Breath being next, all other odors can be all but eliminated as far as I'm concerned using the modern technics.
Breath, cannot totally be eliminated or barely masked can it?
With a deers nose being, what is the percentage?, better than ours and if we can smell another human....damn, poor deer....we stink. [&:]