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There's this thing called statistics and there are these things called multivariate models of regression. Admittedly the longer the study goes on the weaker the statistical power gets, but you can scientifically test for causality like this.
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Except that this is much much much more subjective, because the odds of people with emotional problems wanting to escape and smoke pot is quite likely greater than the opposite. Which is exactly what these numbers mean to me. They can in no way show any kind of causation.