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Never heard of ‘popcorn lung’ before? If you vape, then there’s a good chance you’re familiar with it. But, it won’t hurt to recap the basics…

Popcorn lung (aka bronchitis obliterans) is a rare type of lung disease, caused by a chemical called diacetyl. Its name originates from the artificial buttery flavour which can be found in popcorn, fruit-flavoured drinks, caramel and some dairy products.

After workers in a popcorn factory became unwell after breathing in the harmful chemical, many leading manufacturers decided to remove it from their products to ensure the safety of their employees and consumers too. [...]