Why is Non Stick Cookware So Bad? These days much of the cookware being produced has non stick coatings which have some obvious benefits, but unfortunately also have some pretty serious side effects. Teflon is a perfect example. There are videos on YouTube showing a bird in a cage high over a cooktop where a teflon pan was being used for cooking food. The toxic fumes coming off actually killed the bird. Poor bird, but it’s a perfect example of what I’m talking about. If fumes coming off from cooking ‘one time’ has the ability to kill a small animal then you definitely don’t want to be using that in your kitchen regularly.