I challenge you to explore addiction more fully - it is simplistic to assume that all addicts are opioid-linked and that maintenance dosages would remove harm (methadone programs are basically performing this function, so it is not as though this doesn’t happen).
Firstly, what is societal neutral? Is it where a person is able to indulge in their vices without affecting others, or causing cost to the community? Because if so, drug addiction (of prescription, or legal drugs - alcohol and tobacco - and illegal drugs) fails the test.
Speaking as someone working on the front lines (emergency departments) of societies care for vulnerable people, addiction is an enormous scourge that causes immense harm - particularly with ice which is highly destructive to the individual, their families and the social fabrics of communities.