re: Cannabis causes psychosis. Psychosis causes violence.

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Just because someone does something after consuming something that doesn't mean that is what caused them to do it

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You're kinda correct. There are though drugs like meth, coke and pcp where situations are often caused by them.

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"Before he went shoot up a place he stopped by the store and bought a Dr. Pepper and then he drink the Dr Pepper on the way there so Dr. Pepper caused him to shoot shite up

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This is silly. One Dr. Pepper is not even questioned as a possible cause. Weed can be, whether it was or wasn't a cause.