Airways are critical to our survival. While we put a lot of things into our mouths nothing except air is supposed to go up the nose. Stuff tickling in the nose is a definitive NO! so it’s a good idea to blow whatever that is out as fast as possible.
Anything in the mouth might be food, so the reaction only happens when the whole intricate process of swallowing goes wrong. The coughs from inhaling food are about as hard to suppress as a sneeze and reach impressive air flow speeds (200-500km/h)
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