Ever heard of popcorn lung? It’s a severe lung condition that factory workers can get when they’re exposed to a chemical in popcorn called diacetyl. To be fair, diacetyl occurs naturally in plenty of foods, and in most dairy products. But when you microwave popcorn, the fumes fill your home and lungs. That being said, you’d have to eat a lot of microwave popcorn to develop pocorn lung, but to save yourself the worry it’s best to put kernels on the stove and pop them yourself.