Based on a little bit of internet reading, it appears that odor molecules that enter your nose from human feces are of little concern to your health because the harmful stuff, like the pathogens, are not likely to be picked up and carried through the air.
This seems to make sense, however due to my limited knowledge of biology, I am having a difficult time distinguishing WHY the bad stuff is not likely to become airborne whereas other molecules can, and will cause damage by smell. Chlorine, for instance, will cause some significant damage simply by smelling the airborne fumes (which I assume are the molecules doing the damage).
I have to assume it is a natural defense mechanism that something that smells bad is not something you want to be around (CO being a major exception) but it seems that feces molecules are not a concern. Why?