The best route to boosting your mood, banishing stress and beating cravings may well be right under your nose. More to the point, it is your nose. Tapping into your sense of smell is one of the quickest ways to change your perspective or even your behavior, says Alan Hirsch, M.D., director of The Smell & Taste Treatment and Research Foundation in Chicago. "The bodys limbic center -- the part of the brain that controls your emotions -- is directly connected to the olfactory system."