Seems we all have our own little personal universe orbiting ourselves.
Gross, but true, no doubt.
When I'm eating a mostly raw food diet I have little congestion and my sense of smell becomes so sharp I can smell people coming from a distance. I can also know they've been in a room by their lingering scent.
My memories of when I was a baby and toddler are largely associated with smells - back then my senses were almost overwhelming.