Nowadays, pretty much anything can kill you. That's not even an exaggeration; even the most mundane tasks or lifestyle choices can have serious consequences if you don't know what you're dealing with.
Thankfully, most things aren't deadly if you know how to handle them. Thanks to this Reddit post that asks people to name something that's deadlier than most of us realize, we now know of a bunch of things to avoid in order to live a long life.