The Trouble With Dope
The aspect that seems to be missing from modern debates is about the morality of Not Being a Complete Waste of Space. Whether it is the pothead or the drunk or anyone else who is merely occupying the world rather than living in it, it is entirely legitimate to criticise those who make no effort to pull their weight in the world or assume that society will be there to catch them when they fall.
Great article at spiked.
I had a doctor that particularly hated people smoking marijuana. he said that booze, cocaine, heroin will leave the body in a relatively short time, however mj sticks for weeks. He looked at usage purely from a health point of view.