Not really, no... cannabis won't turn you violent. Ever. Quite the contrary, even. Which is why I've always found alcohol and weed to be flipped around, legality wise. Why is the more harmful, violence inducing drug legal while the healthier, violence subduing natural one is illegal?
(I know about the whole paper fiasco, I'm being rhetorical)
I mean... say you're the governing body in a country. You are given a choice between a drink that will, in many many cases, turn people into violent, raving lunatics that kill, maim, vandalize, rape and whatnot while under the influence... or a plant that will turn people into giggling, eating, simpsons-watching, useless yet comfortably numb morons. From a population control point it should not even be a question, should it?