It is said that the burning sensation from capsaicin (the hot part of chilies) is addictive. It is also said that one becomes “conditioned” to this sensation. The reason is that during the eating of chilies, a chemical in the chile pepper called Capsaicin, irritates the trigeminal cells. These are pain receptor cells located throughout the mouth, the nose and the throat. When your body's nerves feel the pain induced by the chemical on these cells, they immediately start to transmit pain messages to your brain. Your brain receives these signals and responds by automatically releasing endorphins (the body's natural painkiller). These endorphins kick in and act as a painkiller and at the same time, create a temporary feeling of euphoria, giving the chile pepper eater, a natural high.
The body's other responses include increasing the heart rate to increase the metabolism, increasing salivation in order to try and refresh the mouth and by increasing the rate of sweating by the body. Your nose also starts to run and the gastrointestinal tract slips into high speed. Hot & spicy food lovers soon begin to crave these feelings and are soon hooked.

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