There used to be safety concerns about some compounds used to flavor popcorn (diacetyl) and to grease-proof microwaveable bags (PFCs). They're mostly not used anymore, but making your own popcorn might still be safer. Learn more in this episode of BrainStuff, based on this article: https://health.howstuffworks.com/wellness/food-nutrition/facts/popcorn-lung.htm
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