What is chasing the dragon?

Chasing the dragon is a way of smoking heroin. It usually involves placing powdered heroin on foil and heating it from below with a lighter.

Foil used to heat heroin in order to “Chase the Dragon”

The heroin turns to a sticky liquid and wriggles around like a Chinese dragon, hence the name. Fumes are given off and are inhaled sometimes thorough a rolled up newspaper, magazine or tube.