A lot of this was hinted at in the past but the blockage of research prevented us from getting hard answers.
The immediate take home is that smoking is a bad idea if it is chronic. The second take home is that we do not know the active element causing these effects. It is likely THC but not necessarily.
We need to replicate this work with raw cannabis juice. Then we need to test for THC.
Once we know we can produce effective product that may avoid this problem.