Most drug use in America is opioids and meth both of which have higher rates of addiction. Colloquially I don't think most people would refer to 70% as a 'vast

Most drug use in America is opioids and meth both of which have higher rates of addiction. Colloquially I don't think most people would refer to 70% as a 'vast majority' or 30% as a 'tiny subset.' But if the GP meant 30-50% (when factoring in other drugs) as a 'tiny subset', then I guess we don't disagree :) See usage notes [0] [0]: https://en.wiktionary.org/wiki/vast_majority https://en.wiktionary.org/wiki/vast_majority