People respond to the sense of smell on an emotional level more strongly than any other sense. For example, a single aroma can trigger a whole string of forgotten memories. The area of the brain associated with smell is the same area as that associated with memory. The olfactory nerves are located within the nasal cavity and respond to particular aromas. They send the information to the part of the brain where memory and emotions lie. This area connects with another part of the brain (hypothalamus and pituitary gland) which governs our hormonal systems. These aromas trigger a variety of chemical actions within the body, including the release of specific chemicals. Enkephalin reduces pain and creates a feeling of well-being. Endorphins also reduce pain and induce sexual feelings. Serotonin helps relax and calm. Because the olfactory nerves are a direct extension of the brain's limbic system, reaction to smell is relayed immediately.
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