Yes, it is normal for a cast iron skillet to smoke when seasoning it. Seasoning involves applying a thin layer of oil or fat to the cast iron surface and then baking it at a high temperature. During this process, the oil undergoes polymerization, forming a protective coating that enhances the skillet's non-stick properties and helps prevent rust.
The smoking occurs because the oil reaches its smoke point during the seasoning process. The smoke point is the temperature at which the oil starts to break down and emit smoke. It is normal for the oil to smoke during seasoning, and it indicates that the polymerization process is taking place.
To minimize smoking, you can use an oil with a higher smoke point, such as flaxseed oil or grapeseed oil. Additionally, it's essential to ventilate the area well while seasoning to avoid setting off smoke detectors or causing excessive smoke buildup.
Remember to follow the specific instructions provided by the manufacturer or a trusted source when seasoning your cast iron skillet, as the exact temperature and duration may vary depending on the type of oil and personal preference.