The nose contains nerve cells that regenerate every 30 to 40 days. Certain aromatic molecules of essential oils and fragrances react with specific nerve receptors, that then trigger electrochemical impulses that are then sent directly to the brain. All jokes aside. Aromas set off the limbic system which in turn, releases brain affecting chemicals known as neuro-chemicals. The Discovery of Endorphins Enkephalin reduces pain and creates a feeling of well-being.
Endorphins also reduce pain.
Serotonin helps relax and calm. The olfactory nerves are a direct extension of the brain's limbic system, recognition of smell is relayed immediately because of this. Cool thing our Nose is. Recognition of taste, sound and touch is not as immediate as the old olfactory nerves in our noses. When a child reaches the age of one, they have a set of emotional responses that are linked directly with the sense of smell.