Chasing the dragon

Cantonese drug slang phrase

"Chasing the dragon" (CTD), or "foily" in Australian English, refers to inhaling the vapor of a powdered psychoactive drug off a heated sheet of aluminium foil. The moving vapor is chased after with a tube through which the user inhales. The "chasing" occurs as the user gingerly keeps the liquid moving in order to keep it from overheating and burning up too quickly, on a heat conducting material such as aluminium foil.

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