system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does eating spicy food make my nose run?
gpt
Capsaicin is a chemical in some spicy foods like peppers. Allyl isothiocyanate is an oil in some spicy foods like mustard. Both irritate the linings of your nose and lungs. Your body thinks it is being attacked, and does whatever it can to stop the attack. This is why some people sweat, produce tears, produce mucus (snot), or even gag when eating spicy foods.