I think the key phrase to memorize in this situation is "correlation does not equal causation." Cannabis also tends to lower aggressive feelings. If anything, it would have a calming influence on a person. I have to say tends, because anything dealing with the human body could affect different people in different ways, but because someone develops a rash with penicillin, should everyone be barred from using it?
I'm not saying that everyone who tokes up is a harmless fuzzball, that depends on how the person is without being on weed. If you're a dick sober, you'll still be a dick on weed. Did the person also watch TV the night before? Should we ban TV? Did the person drive to the crime? Should we ban cars? Yes, those are ridiculous examples to jump to, but they have as much evidence linking the causality to the actions as weed.
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