An Interesting article about China and Cannabis and Hemp product, and it also states that,
" Chinese companies have 309 out of the 606 patents filed around the world that relate to cannabis."
https://www.forbes.com/sites/andrebourque/2018/07/30/china-is-blaming-canada-for-its-cannabis-problem-but-produces-50-percent-of-the-worlds-supply/#13bc6ec675fb