Watch: Dropping Cigarette Butt in Sewer Leads to Massive Explosion

This video just might drive you to give up smoking.

In a chilling incident caught on CCTV in Tehran, a man is seen dropping his cigarette butt in a hole in the footpath leading into the sewers. Almost instantly, a massive explosion in the hole rips through the ground. The man is then seen crawling away from the site of the explosion.

Watch the footage here.