Studies have been done on various peoples and rates of alcohol/drug consumption (and addiction). Because Native Americans were some of the last folks on the planet to be introduced to booze, they are one of the highest in problem % with alcohol and drug addiction issues. If I recall, Jewish and Greek populations are some of the oldest drinking nationalities/races (whatever you term it) and therefore have the lowest % of abuse within the population.
You can google this research. It is a fascinating set of studies.