The Bhut Jolokia — also known as Ghost Pepper has been around for many centuries and it is believed to have originated in Assam, India. The word Bhut, given from the Bhutias people, means "ghost" and was probably given the name because of the way the heat sneaks up on the one who eats it.
It was only introduced to the western world in 2000. In that same year, a report was published stating it's level of heat as almost double that of a Red Savina Habanero which was believed to be the world's hottest pepper.
In 2007 The Ghost Pepper was certified as the hottest Chili Pepper on the planet in The Guinness Book of World Records.