Back in the days when I was an employee, I used to have lunch at a Thai restaurant. I was considered a special patron because I was there on opening day when the priests from the local temple were blessing the place.
Most days I ordered the same soup, always ordered as "extra spicy". One day the kitchen crew apparently decided to see just what I could take. It was quite an adventure, but the bowl went back empty.
If you eat a lot of hot stuff, the body adjusts and the "stinging asshole" effect goes away. I haven't experienced that for at least a decade.