Smoking kills, or it at least hurts really, really bad.
Surveillance video from Iran shows what happens when a man tosses a lit cigarette down a hole in a sidewalk.
There's a large explosion and the man is blown out of his sneakers.
He's seen crawling away from the scene of the blast.
It's believed that the cigarette ignited sewer gasses causing the explosion.
The video was recorded two years ago, but has just started going viral again.