At the risk of walking into the “beaten zone”*** of someone else's firefight, I'll point out that there is overwhelming scientific evidence for the medical benefits of marijuana.
Risk? As it has been increasingly legalized, it is no longer a "gateway [to the criminal world] drug." There are some reports that some heart attacks occur within an hour of ingestion, but so far I have seen no confirmation of causality. While enemies of MJ correctly note the presence of carcinogens in MJ smoke (but not vapor), they are confounded because MJ smokers have lower rates of cancer than non-smokers. With "vaping" and "edibles" there is no smoke involved. The period of task impairment is minor and lasts about 20 minutes. After that, MJ use is associated with more cautious (= lower risk) driving. I am not aware of any such studies on pilots.
Benefits are legion: pain, nausea, seizures, cancer, spasticity, bone density, inflammatory bowel disease, auto-immune disorders… etc.
Our inherent endocannabinoid system is quite interesting and helps explain the pharmacologic effects of phytocannabinoids.
Yes, the loss of inhibition is a potential [dose-related] and serious problem. Risk and benefit must be carefully weighed as Catholics have done for two millennia in the case of alcohol.
Lest anyone get suspicious or cast accusations—I am NOT an MMJ patient or recreational user, but I do advocate its appropriate use.
***Machine gunners here know that the "beaten zone" is the impact area of the machine gun’s cone of fire.