Well, not exactly. But the amount of stuff they don’t know versus what they do know (factory workers exposed to some combination of the compounds emitted from a bag of microwave popcorn are getting lung disease) would suggest that at the very least you should be careful with that bag of microwave popcorn and the vapors it gives off when cooking/first opened. There’s an article on cnn with the particulars if you happen to eat popcorn and want more specifics