Or, think about how bland food tastes when you're stuffed up with a cold. Much of what we mean when we say a food tastes good is that it smells good.
Taste buds are important.
There actually are two routes to the receptors in the top of your nasal passage that process odors. The most obvious one is directly through your nose. When you smell coffee brewing, you're processing the odor directly through your nose. The other route starts in your mouth. For example, when you eat an orange, you release volatile compounds in the orange.