Well as knife crime seems to be down to drug gangs Hitchens is possibly part of the problem.
He does not even have the balls to admit, that because he is a social conservative, the real reason he does not like cannabis is that people get pleasure from it.
Ironically I would say the worst thing about cannabis is it does have the potential to be a gateway drug for some, with an emphasis on "some", to addictive drugs. Also it is not helpful for those people who are predisposed to psychosis.
As Hitchens does not think addiction is real he rather stupidly ruins one of the better arguments against cannabis.