Why does my pan smoke?

1. The oil has passed its smoke point

This accounts for most pan smoke. Every fat has a temperature at which it begins to break down and release visible smoke, and that temperature varies enormously between fats. Unless you have chosen the oil for the heat, you will hit it.

The telltale: it starts smoking shortly after the oil goes in, the smoke is thin and bluish, and it smells acrid rather than of food. The fix is a higher-smoke-point oil for searing, or a lower heat for the oil you have. Butter for flavor added at the end, not at the start.

Oil at its smoke point is also oil breaking down chemically and tasting worse. It is a culinary problem before it is anything else - food cooked in smoking oil picks up a bitter note.

2. Old residue burning off

A pan that smokes before you add anything, or smokes from the outside and the rim rather than the cooking surface, is burning off what was left from last time. Spattered oil on the exterior and under the rim polymerizes, then carbonizes.

This is extremely common on pans that look clean inside, because nobody washes the outside of a skillet. A degreasing wash including the exterior and base fixes it - how to clean burnt pans.

On a coated pan the same thing happens as an invisible film on the cooking surface, which smokes at surprisingly low temperatures and also causes sticking - how to clean nonstick pans.

3. Seasoning curing, on bare iron or steel

On cast iron and carbon steel, smoke during seasoning is the process working. Polymerization happens at and above the oil's smoke point - you are deliberately taking the oil past it so it hardens into a film rather than staying as oil.

Expect a lot of smoke, ventilate properly, and use a thin coat. If the pan smokes heavily during ordinary cooking rather than during seasoning, the coat was too thick and did not fully polymerize - seasoning carbon steel and cast iron seasoning and care.

4. A new pan

Most carbon steel ships with a protective coating to prevent rust in transit - beeswax on de Buyer pans, lacquer or oil on others. It must be scrubbed off before first use, and if it is not, it smokes heavily and smells unpleasant the first time the pan gets hot - carbon steel problems and fixes.

New coated and clad pans can also carry manufacturing residue. Washing any new pan before first use takes a minute and avoids this entirely.

5. The pan is just too hot

Usually an empty pan preheated on high. With no food or liquid to absorb energy, the surface temperature climbs far faster than people expect, and cast iron keeps climbing after you turn the heat down because of its thermal mass.

• Preheat on medium, not high, for almost everything.
• Add the oil once the pan is hot, not at the start - then it spends less time at temperature.
• On coated pans, never preheat empty. This is the one case where overheating is a genuine safety matter rather than a cooking one - is nonstick safe.
• Match burner to pan base, or the exposed ring overheats while the middle is fine - cookware for gas stoves.

6. The food, not the pan

Sugar, marinades, honey glazes, milk solids and small dry particles all burn well below the temperature the pan is at. Smoke that starts when the food goes in, and smells of what you are cooking, is this.

Nothing is wrong with the pan. Lower the heat, or accept that a sugary glaze added at the start will burn and add it in the last minutes instead.

Diagnosing it in ten seconds

1. Before anything is added? Residue, or a new pan, or simply too hot.
2. As soon as the oil goes in? Wrong oil for the heat.
3. Only when food goes in? The food - sugar, marinade or dairy.
4. From the outside and rim? Exterior residue.
5. Smells acrid and chemical? Oil breaking down, or a factory coating.
6. Smells of hot metal only? The pan is dangerously hot and empty - take it off the heat.

When smoke actually matters

Mostly it is a cooking problem rather than a hazard. Two exceptions:

• A coated pan smoking is past where its coating is happy. PTFE degrades when badly overheated, and an empty coated pan on high heat is how that happens. Take it off the heat and ventilate.
• Oil approaching its flash point is a fire risk. If oil is smoking heavily, remove the pan from the heat rather than adding food to it, and never add water.

Otherwise, smoke means turn the heat down and check which oil you are using - cookware for deep frying covers oil temperature management where it matters most.

High-smoke-point oils on Amazon — the simplest fix for the most common cause.