Here in the land of the give a damn dog hunters, pressure quite frequently comes from a loose deer hound. All in the name of running foxes .

Deer do get pressured in lots of ways, but think on this.... when you are hunting, or staying in one area for an extended period of time, your scent accumulates and builds up... so a deer knows that a human or other threat was there for quite some time (several hours). If this becomes a regular occurance, then I suspect a deer would get wise to it pretty fast. If you are just passing through, your scent will be minimal, and unless you were just there, a deer will be able to tell of course that it is old or that you were just passing by. I think in most places they are used to smelling humans, dogs, yotes or whatever.... its when they get a big ol fresh whiff of it they get spooked.... or like others have said... if its in a place they don't expect it, and can't pinpoint it.