Later
I'd expect a substantially higher rate of dependency given the hyperbole that's being attached to it.
Three words in and wrong already - the paper in question is a review of existing studies: http://onlinelibrary.wiley.com/doi/10.1111/add.12703/pdf.
demolishes claims that smoking pot is harmless
This claim is demolished far more often than it's actually made - straw man, anyone? And a government that banned everything that isn't "harmless" would make the Soviet Gulag look like a picnic.
It doubles risk of developing psychotic disorders, including schizophrenia
The text of the paper itself (see link above) doesn't support that claim: "The common cause hypothesis was harder to exclude, because the association between can- nabis use and psychosis was attenuated after statistical adjustment for potential confounders, and no study assessed all confounders. Researchers who remain sceptical about a casual explanationoftenarguethatacausalhypothesisisincon- sistent with the absence of any increase in the incidence of schizophrenia, as cannabis use has increased among young adults. There is mixed evidence on trends in schizophrenia incidence. [...] It is difficult to decide whether cannabis use has had any effects on psychosis incidence, because even if the relationship were causal, cannabis use would produce a very modest increase in incidence. [...] If we assume that cannabis use plays a causal role in psychosis, it will be difficult to reduce psychosis incidence by preventing cannabis uptake in the whole population: an estimated 4700 young men in the United Kingdom aged 20–24 years would have to be dissuaded from smoking cannabis to prevent one case of schizophrenia."
I just don't get the anti-pot hysteria. It was legal before 1937.
I have done over a 40yr study, and my findings are different.