There is no evidence suggesting government can solve the problem of drug abuse - but plenty of evidence that it can make things worse.
While drugs affect the users, they sadly are not the only ones affected.
Almost everything anyone does "affects" someone else; if that's the test for government authority, we can kiss freedom goodbye.
Whether we want to admit it or not, that also impacts on our freedoms, primarily because we are getting stuck with the bills. In addition our society is becoming more violent which in the long run will continue to erode our freedom of movement.
While most everything does affect someone else, some are positive. Drug abuse is nothing but a negative over the long haul. My biggest concern is the children who are not only facing probable physical & mental abuse, but indoctrination into the drug culture. Thus the problem expands exponentially.
Drug abuse is a two sided coin in which both sides leave us with lost freedoms. No matter which side the coin lands on we lose. If we try to force non usage we lose, and if we legalize it we also lose.
I think we can indeed kiss freedom goodbye, as I see no solution. Especially since we have taught generations of American youth to be irresponsible for their actions.