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Media Leaping to Extremely Faulty Conclusions from Study on the Effects of Marijuana on the Brain
... "So precisely what do these findings tell us in regard to pot use and
health? Not much. Since the study design is not longitudinal,
investigators cannot determine whether these differences are caused by
subject’s cannabis use, whether these differences existed prior to
subjects’ ever trying cannabis, or whether these differences persist
when users’ cannabis consumption ceases."
"Most importantly, investigators in this study failed to determine
whether any of these differences are positively associated with any
measurable adverse performance outcomes, such as cognitive performance
or quality of life. It may be that these cannabis users are functioning
in their daily lives in a manner that is indistinguishable from
controls, in which case the imaging differences may hold little if any
real-world significance. (In fact, one of the paper’s authors acknowledged, “[C]hronic users appear to be doing fine.”)" ...
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