Capsaicin is chemical found in fruits of the genus Capsicum, which includes peppers. …Allyl isothiocyanate, on the other hand, is a colorless oil that can be found in things like mustard, radishes, and wasabi. …These chemicals end up not only causing a “hot” sensation on your tongue, but also irritate the mucous membranes in your nose, causing them to become inflamed. This triggers those membranes to produce extra amounts of mucous as a defense mechanism to try to keep out whatever unwanted substance or particles are causing the irritation.
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