They didn't find that cannabis use leads to cardiovascular disease. They found a strong association between cannabis use and cardiovascular disease in a very large study. Correlation isn't causation. The study itself acknowledges that. That doesn't mean it's an invalid or useless study that didn't add to the body of scientific knowledge and evidence about the relationship between cannabis use and cardiovascular disease - I think we agree there. That's how science works. Observational studies do not definitively prove causality.

After reading the study, should we update our posterior on the hypothesis that cannabis use causes cardiovascular disease to nudge it in the direction that it does? Yes - that's just Bayes' theorem. Does the probability go to 95%+? No, of course not; I'm not claiming otherwise. It's still useful research.

Also, worth noting that MI risk spikes several-fold within the first hour after cannabis use (and that's not caused by cocaine).