Replace "drug use" with "mental health" to broaden the discussion and it eventually becomes apparent that societal issues such as individual well-being, whether

Replace "drug use" with "mental health" to broaden the discussion and it eventually becomes apparent that societal issues such as individual well-being, whether drug addiction, mental instability, or a morbidly obese inducing lifestyle has costs that even a staunch libertarian would be wont to address at a systemic level, not just a notion of letting 'the private sector' or charity do the work.