Although botanically speaking, the fruit of capsicums are berries, the peppers are considered as vegetables or spices for culinary purposes. Depending on flavor intensity and fleshiness, their culinary use varies from use as a vegetable (e.g., bell pepper) to use as a spice (e.g., cayenne pepper).
Chillies originated in the Americas. Their cultivars are now grown around the world, because they are widely used as food and as medicine.
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The capsaicinoids are unique compared to other spicy substances, such as piperine (black pepper) and gingerol (ginger) in that capsaicin causes a long-lasting selective desensitization to the pain and discomfort, as a result of repeated doses. The result is an increasing ability to tolerate ever hotter foods and permits one to assume the title of "Chile-Head" or "CH" for short.
People that eat lots of spicy capsaicin-rich foods build up a tolerance to it. The incentive: Once a person has become somewhat desensitized to the extreme heat of the "hotter" Chiles, he or she can starts on a new culinary journey. Not being over powered by the heat factor, the palate now has the ability to explore the many diverse flavors offered by the myriad of different Chiles that are currently available from around the world.
The hottest chillie discovered and proven is Bhoot Jolokia from Assam