What does chasing the dragon mean in Cantonese?

In Hong Kong slang, the noun "chasing the dragon" has a special meaning - it refers to drug taking, especially the act of smoking heroin powder by heating it with tin foil. It is a specialized verb. Hong Kong's anti-drug campaign has a slogan: "Don't chase the dragon when the dragon is alive." It can be seen that the term "chasing the dragon" is widely used.

Zhong Youji has already talked about it upstairs.