Earlier quoted context omitted.
It is important to stress that China was ruled, at the time, by a government that was widely seen as "Nonchinese" -- this sense of external rule surely had a great deal to do with the emergence of mass addiction, as the Ching state that imposed the laws had serious legitimacy issues (and would collapse less than a century later.)
How was it nonchinese?
Quotes from the PDF "What is at issue is not the magnitude of Qing achievement, but Ho's statement that "the key to its [Qing] success was the adoption by early Manchu rulers of a policy of systematic sinicization". The new scholarship suggests just the opposite: the key to Qing success, at least in terms of empire-building, lay in its ability to use its cultural links with the non-Han peoples of Inner Asia and to differentiate the administration of the non-Han regions from the administration of the former Ming provinces."
""Sinicization" -- the thesis that all of the non-Han peoples who have entered the Chinese realm have eventually been assimilated into Chinese culture -- is a twentieth century Han nationalist interpretation of China's past."