[craftyguy]

or, maybe some folks just want an escape from stress / real life.

or, maybe they got hooked after being perscribed painkillers for an injury

or, maybe they're suffering from some mental illness

or, literally any number of other reasons besides some evil nation flooding the US with drugs and somehow 'forcing' citizens to take them.

The point is, you can choose to go after the suppliers, but the underlying problem is still there. Until that's addressed (mental healthcare, serious punishment for over-perscription, etc), we'll just see a new drug take the place of the old.