Smelling with your mouth and with your nose

"Researchers have presented the first clear evidence that olfaction is uniquely a "dual" sense, in that the brain perceives the same odorant molecule differently if it arrives through the nose rather than the mouth. In the August 18, 2005, issue of Neuron, researchers report that the smell of chocolate activated different brain regions according to whether the odor was introduced into the olfactory system through the mouth or through the nose."
This is pretty interesting. I guess that whole holding your nose while you eat gross food thing is partially explaned by this newsrelease.