Man, that was an ominous sentence. It's almost as if I was setting up an ironic subheader ...
Why It Will Kill Us:
To be fair, current science isn't completely sure whether the nicotine vapor in e-cigarettes is super dangerous. Especially compared with regular cigarettes, common sense alone indicates that they can't be described as all that deadly. However, remember those weird flavors vapers so enjoy that I was talking about? Those are a different thing altogether. In 2015, vapers got an early Christmas present in the form of scientific research that revealed the secret ingredient in many e-cig refill liquids: diacetyl. This relatively harmless-sounding chemical is OK to eat, but when you breathe it in, you risk an irreversible, debilitating lung disease known as bronchiolitis obliterans, aka popcorn lung.
Although incurable, potentially fatal, and dangerous to the point of possibly requiring a lung transplant, popcorn lung is not immediately deadly (as far as we know). It gains its name from a popcorn factory where workers inhaled diacetyl-containing artificial butter flavoring over a long period of time, so a little vaping might not give you enough to get it (as far as we know). It may not even necessarily be an automatic side-effect of vaping at all (AS FAR AS WE KNOW).