This is pretty important kind of research. Tons of people are using this stuff medically and while it's obviously a better solution for pain management than long-term use of things that can kill you if they're suddenly unavailable, like opiates, we should still be highly aware of mitigating whatever harms could come from the widely used alternatives. It would also be more interesting to see harm in aspects of things…
Lots of people use it recreationally with the belief it’s not bad for you at all. This kind of research will help to show them that’s not the case.
We're talking the difference between 2 and 200 milligram doses of THC here in terms of how it affects people on these levels. One comes in a soda at the store down the street from me. The other you can't get like that and might send your average recreational user to the hospital with a panic attack.
I'm wondering also if one of the big factors here is oxygen deprivation. These sound kind of like the same kind of numbers of cognitive decline that you see in air pollution, maybe just generally clogging your lungs with smoke could be comparable.