At this point, if you ignore all the evidence that points at long term effects on cognition from marihuana consumption, it's more your conscious decision rather than lack of data.
At this point if you ignore all the evidence that these people have anxiety, or were in otherwise shitty environments and states in the first place, whether genetic nature or nurture you might want to just say we're collating and correlating rather than finding causes. Conscious decision my ass.
