Popcorn lung has been making its way around social media and media sites again, as teen vaping becomes a big topic in North American cities.
It is a disease called bronchiolitis obliterans that essentially scars and closes the tiny, individual sacs in our lungs that are used to absorb oxygen when we breathe.
The idea that e-cigarette use causes popcorn lung is that the famous event that pushed the disease into the public view, is based on the fact that some e-liquids contain diacetyl.
Most of the time you'll find it in flavoured food products, but since people like to taste their vape clouds, e-liquid manufacturers have been using diacetyl in their products that are based around dessert flavours.
But there's more to it than simply, "Chemical X caused Problem Y with this group of people, therefore Chemical X must cause Problem Y in ALL other instances of its use!"
Below you can see the video from DashVapes that explains popcorn lung pretty well, and also explains why you shouldn't just believe the negative attention thrown around by the media and the uninformed public.