Smoking marijuana is not officially a part of hip hop culture but it is something that is often referenced to in many rap songs. Some rappers such as Bone Thugs N Harmony, Cypress Hill and Ludacris have written songs dedicated to marijuana and getting high.
Soft Lipa is an underground rapper in Taiwan. He quite has a big following in the Mandarin-speaking hip hop community in Taiwan and in Mainland China. Here's a song from Soft Lipa called 煙霧瀰漫 (Haziness). Its a song about marijuana and getting high. Soft Lipa can flow very well in Mandarin. Soft Lipa is definitely someone to watch within the emerging Chinese hip hop community. There will be definitely be more posts on him in the future.