This is a sketchy article about a study which is not even named because it has not yet been presented. It will be presented in the next week. I would take this entire thing with a grain of salt.

The website also has a bunch of other sketchy articles playing up the alleged “dangers” of cannabis, usually by the classic approach of conflating correlation with causation.

I'll refrain from suggesting this to be deliberate on the authors' part, but there's obviously some bias at play here.