I'm no authority or researcher, but I would guess that using cannabis is more than likely to be reported to trigger the early onset of mental health issues like schizophrenia, but it is unlikely that it is the cause.
In other words I would suspect that people with mental health issues may be using cannabis as a form of self medication. So the correlation between people with pre-existing mental health issues and people using cannabis would be seen. I just doubt that the cannabis use is the cause of this specific illness.
It's much more likely that with diseases like schizophrenia people who would eventually suffer from it's effects may be more likely to act in ways that could damage their own health with their own behaviors, such as abusing medications, illegal drugs, alcohol and so on, that may advance the development of the disease. So it's probably not the cannabis use that is the actual cause of these kinds of mental health issues, but it more likely is a contributing factor that may speed up what could have happened eventually.
Everybody's chemistry is pretty unique, and if you add recreational chemistry into that experiment, it is reasonable to assume that you are going to increase your risks for negative affects. That is not the same thing as what these kinds of studies are showing.
I think we haven't seen any evidence that the cannabis is the cause of the outcome.
One might also consider that paranoia to a certain extent, is probably healthy, and that madness is also normal, it's a spectrum for a reason we all are crazy. Normal can only be defined by what is accepted by the majority of your peers. And then on a larger scale what is accepted by your culture and society in general.
Since in many instances using cannabis is illegal, maybe a user should be a little paranoid about breaking the law, the outcome if you caught could have a very negative impact on your life in some circumstances you could, lose you job, be arrested, fined, lose respect and trust of people who have different opinions about your behavior and so on.
It's only when your paranoia doesn't go away or affects you in ways that inhibit your ability to manage your life and relationships that you may want to seek help with it.
Just like any person may become paranoid when that law enforcement officer pulls in behind you driving down the road, even if you may have nothing to fear. Or if you get paranoid when say you walk out to the edge of the grand canyon even though you aren't typically afraid of heights. Paranoia is also a healthy trait that is part of our innate self preservation.
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