Not hardly, it is the current status quo and has been for centuries. I hardly consider this anarchy.

Though the way I understand you plans, is more akin to the drug war than anything. Spending lots of effort and lots of money, infringing on civil and personal liberty... mostly to keep people from "harming themselves". Sure, in some regards there are addicts whose problems spill over to affect others. But the solution has still been far worse than the problem.

And yes, people choose to engage in unhealthy behavior all the time knowing full well the implications.

For who could be free when every other man's humour might domineer over him? - John Locke (2nd Treatise, sect 57)