Actually I don't know why it does, but if you go into almost any Subway or even come close to one you are hit with a smell that I can't even dscribe. It's not pleasant but it's not horrible either. If you stay in the Subway long enough your clothes will actually still smell like it after you leave it is that strong. My guess is that it is the bread yeast as it smells kind of similar to when my old roommate brewed his own beer. Anybody know the real reason for "The Subway Smell"???