The amount of trans fatty acids formed when cooking oil is boiled until it smokes is very small. The fumes produced when cooking are equivalent to creating haze in the kitchen and inhaling it yourself.
"Self-pressed oil" and "stupidly pressed oil" have low smoke points and can easily produce oil smoke. Kitchen fumes are particularly harmful to pregnant women and can affect the development of babies. The smoke point of soil-pressed soybean oil is about 160℃. Relatively speaking, the Smoke point of sesame oil can be close to 180℉.