Why Does Cast Iron Smoke When Preheating?

A cast-iron skillet may smoke because the burner is too hot, old food residue is burning or a thick oil film is reaching its smoke point. Reducing heat and cleaning the pan can help.

Inspect before heating

Look for burnt residue or sticky pooled oil. Wash and dry the pan as needed rather than trying to burn a dirty surface clean during normal cooking.

Preheat gradually

Start at low or medium heat and allow the thick iron to warm through. Avoid leaving an empty pan on high heat for a long period, especially on a powerful stove.

Add fat at the right time

Use a modest amount of oil suited to the cooking temperature. If the pan starts smoking heavily, remove it from heat safely and ventilate the kitchen.

Frequently asked questions

Does smoke mean the seasoning is ruined?

Not necessarily. It may simply be overheating oil or residue, but inspect and clean the surface before the next use.

Related: how to clean cast iron skillet after cooking.