Using nonstick pans or other nonstick cookware on an open wooden fire is generally not recommended. Nonstick coatings are typically made of a material called polytetrafluoroethylene (PTFE), commonly known as Teflon. When exposed to high heat, such as an open flame, PTFE can release toxic fumes that can be harmful to humans and pets.
The fumes emitted by overheated nonstick pans can cause a condition known as polymer fume fever, which can result in flu-like symptoms such as fever, chills, headache, and respiratory irritation. These symptoms are usually temporary and subside on their own, but prolonged or repeated exposure to the fumes can have more serious health effects.
Additionally, subjecting nonstick coatings to high heat can cause them to break down and deteriorate more quickly, reducing their effectiveness and potentially allowing the release of harmful substances into your food.
If you need to cook over an open fire, it is advisable to use cookware that is specifically designed for such use, such as cast iron or stainless steel. These materials are better suited for high-heat cooking and do not have the same risks associated with nonstick coatings.