China has a long memory. They look back at the Opium Wars, at the profits Europeans made by selling opiates to the Chinese, and now they shrug their shoulders. This is based on my personal experience, I have met middle class people in Shanghai who told me as much. And not very politely. They are not bad people, they are simply reflecting what they are told.
Of course this is not the right way to behave but on the list of problems for China's leadership I'd say an opiod crisis overseas is some way off the top of their priorities.
If it becomes a domestic issue, which we wouldn't hear much about, then maybe things would look different.