Not yet investigated
What we have so far
CB1 is the densest receptor in the brain and scarce in the brainstem, which is why cannabis does not stop breathing the way opioids do. CB2 is mostly immune.
This star is on the map because the show intends to take the question apart properly — the trials, how it is actually tested, whether the thing sold is the thing studied. That work is not done yet, and nothing here should be read as a conclusion. When the investigation is published it will appear on this page.