It's not totally worthless. It shows that recreational usage may lead to cardiovascular issues. Is it from the THC itself, way of administration, eating crap on munchies or having no motivation to move your ass is something for another paper.
Or is it a statistical artifact from crap control of confounders, who knows?
Not worthless for the anti-cannabis lobby, I suppose.
If one person reads up how bad it is for them thanks to some random paper then it's not worthless.