What does this study of cannabis and cardiovascular disease mean?

 What does this study of cannabis and cardiovascular disease mean?

A study published in late February by the Journal of the American Heart Association noted as its conclusion, “Cannabis use is associated with adverse cardiovascular outcomes, with heavier use (more days per month) associated with higher odds of adverse outcom…

As far as I can tell, IANAD, frequency/day of cannabis use doesn’t seem to have been taken into account. Intuitively, it would seem that taking a single bong hit vs. smoking multiple joints in a day …