I always enjoy opening my chocolate cabinet and inhaling deeply even if I don't plan on eating it. Usually just a deep breath of chocolate "fumes" is enough to curb my desire. Now I apply that to all my foods--inhale deeply before eating. Half the delight of eating is the smell.
Your tongue only can pick up on bitter, salty, sour or sweet tastes, so the rest is up to your olfactory senses. We are able to distinguish blueberries from strawberries, for instance, because of the odor molecules. 70-75% of what we perceive as taste is actutally from our olfactory senses.