Nice movie, but the book it is based on is legendary. It was a very political book that argued that hash isn't heroin, a view that was/is shared by the hippies that created christiania in Copenhagen.
And that view seems to be more and more fading, it seems to me that activism these days is all about legalizing all drugs. In Oslo the police claims we have 5 open-air drug markets, and the police have vowed to close 4 of them down - the one market they will leave alone is the only one that sells other drugs than cannabis. We are discussing legalizing heroin, or at least giving it medicinally to addicts, while cannabis will remain illegal. Something went wrong somewhere.