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A comment on New study makes link between use of potent cannabis and psychosis. Parent comment

Re:New study makes link between use of potent cannabis and p... by shkkmo on Wednesday March 20, 2019 @10:34AM (#19442617)
No, it is impossible to draw conclusions about causality from such statistics only studies. The only way to establish causality is a randomized experimental intervention.

The sort of study you describe can distinguish to some extent between "A causes B" and "B causes A" but can't tell them apart from "C causes A and B"

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Re:New study makes link between use of potent cannabis and p... by mirimir on Wednesday March 20, 2019 @08:11PM (#19448268)
I was going to make that point too, but the idea of randomly providing cannabis and placebo was too implausible.
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