Who created the opioid epidemic?

In the U.S. doctors often prescribe opioids for pain management, and it's no secret that these substances are a big business for pharmaceutical companies -- and, increasingly, it's no secret that exposure to these legal pills are turning patients into unwilling addicts. So how exactly did the U.S. come to find itself in the grip of an opioid epidemic, and who should be held responsible? Perhaps most importantly, how can the nation recover?

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