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1.
A theoretical point of experience in eating chili products. Once you have reached this limit you have broken the chili barrier and chili products no longer present the physical discomfort or level of emotional intimidation they present to inexperienced chilli consumers.

The chili barrier varies from person to person. Some people never break the chili barrier and will always find eating chili to be uncomfortable.
When I was living in China, I ate so much chilli flavored food that I eventually broke the chili barrier.
by House Martin February 20, 2013