Weed in China is called "Da Ma", and it was really hard to find - since toking doesn't seem to be very popular in China. The people over there think smoking weed is really bad for your health - but strangely enough, cocaine (a.k.a. "Bai Fen") and GHB (a.k.a. "Kai Xing Shui" which means Happy Water) are both really popular and easy to get.
Weed is relatively expensive over there - I picked up a quarter at around $20/gram. And the high is very different from the weed I smoke in the US... it's kind of hard to describe - but my buddy and I agreed that it gives off more of a spiritual high