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Sadly, drug addiction is a curse of the free countries. There are addicts in most relatively free countries.
Freedom allows anyone to destroy their brain and themselves with drugs. Often I think they are allowed to abuse freedom for too long a time.
However, what is the alternative? I doubt you will see many addicts on the streets of Pyongyang or any other country under the yoke of slavery. They would likely be snuffed, or thrown into a labor camp, where they are more concerned with getting their next meal...rather than dope.