A very common claim is that once you start cooking with a cast-iron pan, you never really need to season it again. As you cook, the seasoning just builds up. However, the way I understand it, seasoning only happens when you heat the oil so much that it starts to smoke. However, smoking oil has many carcinogens, and you're not supposed to eat it. So how does the seasoning build up if you never heat the pan enough (while cooking) for the seasoning process?
Why do people say that cooking in a cast-iron pan will build the seasoning, while also saying that you should never cook to the smoking point
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Best Answer
Yes, the two pieces of advice are contradictory. You have to choose which one you prefer to follow. If you decide to only use your pan below the smoke temperature of oil, the seasoning will not build up during cooking.
In typical use, people do heat their pans above the smoking point, and the seasoning does build up. This is how cooking has been done for centuries, with tasty results, while cooking without heating the oil up produces not-very-exciting results for certain foods. People can choose to use low-heat cooking methods and avoid the "smoke point" part too, but that is not what usually happens. There are many factors why more people use the "high heat that seasons" approach:
Because of the last one, I would suggest that, if you prefer to follow the "smoking point" advice, you switch to a different type of cookware.