Concept 2:
To buy faags or booze, you have to buy a license off the Government. Buyers of this license accept any risk to themselves pertaining to their vice, ie if you get lung cancer or cirhossis of the liver (sp?) and a doctor attributes it directly to your vice, you have to pay all bills to NHS. If you commit crime and are found guilty while under the influence, you lose your license and have to pay all damages in full.
Simples.