"The applications of the Smellitzer and similar technology aren’t limited to selling you snacks, either. In August of 2006, Popular Science reported that the University of Central Florida was using them in war games. Specifically, Jacki Morie, a researcher at the school’s Institute for Simulation and Training had created something called a “Scent Collar,” emitting smells of trees and metal, as appropriate, in simulated events. The Collar, in the words of Popular Science, transformed an experience which was akin to a “fancy videogame” to something “more […] like a real place.” Which is kind of strange, because Morie got her idea from fantasy land — she used to have an office at Disney World, and her experiences with the Smellitzers probably inspired that idea."
Now I Know – The Nose Knows