Well it certainly isn't too common, but I don't think it is totally outrageous to smell food and then have to run to the bathroom. It's common for people to smell food and get an upsets stomach, or smell perfume/cologne that turns their stomach - so I don't see why that, in turn, wouldn't trigger bowel trouble. Lots of times when I have an upset stomach D goes hand in hand.
I don't know, just my theory.
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