That and the fact that half the narcs would have to find honest work.
That shouldn't be too hard...what with all the stoners who can't be productive members of society.
But what the hey...I don't mind if someone wants to fry their brain. To each their own. Me, I'd just recommend that those people sign away any and all claims that society or the government owes them any support after they screw up their lives.
I mean, it's bad enough that I have to support illegal aliens, welfare bums and other dregs of society. I'm not about to subsidize another group of brain-addled chumps.