Mao's government compelled addicts into rehab and summarily executed drug dealers [0][1]. Drug trafficking is still a capital crime in the PRC. In 2017, 13 traffickers were sentenced to death at a public trial in front of 10,000 spectators [2].

[0] https://www.scmp.com/article/547678/maos-drug-lesson-world

[1] https://en.wikipedia.org/wiki/History_of_opium_in_China#Unde...

[2] https://www.thesun.co.uk/news/3906319/china-drug-dealer-mass...