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Some people will suffer a mild form of an allergic reaction and have minor symptoms including such things as hives. Those with a more serious reaction to onions may even have problems just breathing in the smell of onions without having an allergic reaction that can compromise their health.
This gas reacts with the water in your tears to form sulfuric acid. The sulfuric acid burns, stimulating your eyes to release more tears to wash the irritant away. Cooking the onion inactivates the enzyme, so while the smell of cooked onions may be strong, it doesn't burn your eyes.