More common even than stories of cannabis smokers committing violence are stories of criminals being convicted of cannabis possession alongside a violent offence or other crime, in which smoking of the drug was not stated as a fact. Here’s one recent story that could stand for hundreds: Teenagers armed with knives and screwdrivers go on terrifying car-jacking spree.
If anyone would care to bet that these young men merely possessed cannabis without ever having smoked it I should be happy to offer generous odds.