Probably not. Then again, for a long time was there anywhere in the world that didn't practice slavery? Is popularity really the best system to evaluate these laws?

Yes.

Probably places like Somalia and other countries where there is no functioning civil government.

I don't think that's so much "allows" as "is unable to control, effectively or otherwise".

Indeed, Somalia (to use that one example) is a fairly heavily Islam state, which has pretty stringent and ardent anti-drug views.

Afghanistan is also a fairly heavily Islamic state, but it has quite a history of drug production and distribution.