RE: How much human scent is "enough"?
Ask yourselves though what is worse, a full blow nose full of human/gas/bacon/smoke/chew/BO/etc or, a faint hint of human.
I still like the skunk theory, if we smell a skunk and he's 100 yards away, we go eew, skunk but if he's a couple feet away and we get a nose full, even we run. Deer that live in human environments smell humans, they don't leave the county unless it smacks them in the face. I like my chances much better doing everything possible to reduce my human odor.
And tell me about the windicators that pass through a deers ears and don't flee when downwind. I think Matt PA told that story once.