Andrew Huberman has a doctorate in neuroscience and is a professor at Stanford, and his podcast, Huberman Lab, is comprehensive, exhaustively researched, intelligent, and enlightening . . . but the last two episodes I listened to have been pretty brutal-- in a very nice, non-judgmental way;
1) the main takeaway in the two hour long episode "What Alcohol Does To Your Body, Brain & Health" is that more than FIVE servings of alcohol a week is really bad for your brain, mood, sleep, liver, longevity and telomeres . . . there's so much more in there but that's what I remember-- and for a guy who enjoys beer, it's a tough constraint to follow;
2) the big takeaways from "The Effects of Cannabis (Marijuana) on the Brain & Body" are:
-- people under the age of twenty-five should NOT use cannabis because of well documented decrease and thinning in gray matter-- that's the good stuff stuff in your brain, especially in the prefrontal cortex -- and an increase in future incidence of schizophrenia, bi-polar disorder, psychosis, depression, and anxiety;
--pregnant women should never use cannabis;
--while there are some pros for people over 25 who use cannabis-- reduced anxiety, pain relief, increased focus and creativity-- if you use cannabis more than twice a week, then you lose these benefits, build a tolerance, reverse the anxiety reduction, screw up some receptors in your brain, and increase likelihood of mental illness down the line;
--smoking cannabis, or any drug, has a whole host of other negative health benefits that aren't even associated with the drug . . . and the same goes for vaping;
so while cannabis might be "better" than drinking alcohol, Huberman doesn't think this makes a particular good case for chronic use of the drug-- because that comes with its own costs.