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The main reason pepper makes us sneeze is that it has a coating on it of a chemical called piperine. This is the chemical that makes pepper spicy. When pepper gets inside your nose, this chemical really irritates its lining, triggering your sneeze reflex to expel it. A secondary reason it might make you sneeze is that pepper is usually ground up into tiny bits, which can get in your nose and make you sneeze for the same reason as things like dust.

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13y ago

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