Actually it is true that some races have less of an ability to efficiently process alcohol, and get drunk much more easily, including Native Americans. Although I think the reason for the very high incidence of serious alcoholism among their population has a lot more to do with being systematically brutalized and then oppressed for two centuries or so, continuing to this day.
I've never heard anyone try to suggest that Chinese are more prone to opiate abuse. In fact I'd say Americans are more prone to opioid abuse than most others in the world.