FDA has reported that the chemical coating used n microwave popcorn bags breaks down to a substance called perfluorooctanoic (PFOA) when heated. This is a carcinogen! Exposure to an acid extracted from it has led to cancer in animals!! Now you are worried. So, I guess its back to using the old air popper or frying the kernels in some healthy oil.
But that is just part of the bad news. Recently a group of at least 43 workers in Cincinnati sued the makers of the flavoring agent that produces the buttery taste of popcorns. They claimed that their lungs were irreversibly damaged by inhaling fumes from the chemical diacetyl, which is used to provide the buttery taste. The respiratory disease is even called “popcorn workers lung,” Imagine the amount of these dangerous fumes you would have inhaled over the years!