According to IranNegah.com, addicted people freely use various kinds of drugs in Mashhad, Iran--and police don't care.
Perhaps addicts are easier to control than healthy, free thinking individuals. But if the abilities of enough productive members of society are significantly impaired, this could logically impact the stability of that society.
Although drugs and alcohol have contributed to the artistic output of poets, writers, musicians and artists through the centuries, the potential for a steep downfall is clearly ever present. It is so ironic that something that initially seems freeing can eventually be so enslaving.