The "war" on drugs costs billions with spending on Police, courts, prisons and not forgetting medical due to dirty/mixed drugs due to greedy dealers and "Legal" highs.
Yet if the coin was flipped, Governments would not only "save" the above, but would now make millions through taxes and freeing up police and courts to deal with "real" criminals. (Start with Bankers)
And not forgetting Governments would now have funds to "help" the hardened drug addict who wanted help with walk-in centres, where they could book themselfs in for a few weeks to get the help they need.
All in all a lot more winners in Legalizing drugs, and don't forget the youngsters out there who have criminal records for just having a few spliffs.