Yes, Jaclyn, BRAIN DAMAGE: scientific facts and "skepticism".

I can't take this guy seriously I can't
you know it worked what 2019 we have someone who's freaking out about this is your brain on drugs like do you guys remember when you were in like middle school at least for me they have that commercial but they would play up like an egg this is your brain then they would crack it into frying pans and if you like this is your brain on drugs don't do marijuana I'm gonna tell you the source I'm quoting in just a moment but pretend for a moment you don't know the source and I don't know the source pretend you're just encountering this as a scrap of text floating around the internet with no idea what kind of authority comes from and pretend there are no other sources available to allow me to prove to you that Jaclyn Glenn is wrong that Jaclyn Glenn has been lying that in fact marijuana does cause brain damage what would you make what would you make of this this claim I think there's something about the very structure and nature of the information being presented there's something something about it that demands to be taken seriously quote our study demonstrates a pattern of gray matter of volume changes in a group of regular cannabis users compared with a group of occasional ones just an interesting note everyone who participated in the study was age 19 to age 29 so there were no effects of the brain here of old age or other cumulative habits over many years regular users exhibit a decrease in gray matter volume if the medial temporal cortex temporal Pole parahippocampal gyrus left insula and orbital frontal context cortex I'm not a brain surgeon I'm not let me ask you in the audience if I hadn't struggled to pronounce the different parts of the human brain there do you think any of you would have just felt comfortable with marijuana causing brain damage was marijuana marijuana causing a loss of very matter in just some parts of the brain and not others was there anyone in the audience who is sitting there thinking hmm okay the temporal cortex temporal Pole that I live with that's no problem but wait a minute it causes brain damage also in the orbital frontal cortex okay forget it I'm out okay now I'm gonna take this seriously guys now I'm gonna quit smoking marijuana before the first four or five parts of the brain you mentioned being damaged by marijuana that I was cool with but not that last cortex that was one cortex too many that was a bridge too far I don't see it I mean there are people who decide to smoke cigarettes and they feel a disconnect like well that does damage to my lungs but somehow it doesn't do damage to me like as if who I am and my lungs are two really separable things they drink alcohol and they think it just damages their kidney and their liver and they say they're comfortable with whatever happens to their kidney and liver as if you know my kidney and my liver that's not who I really am that's not really me your brain is your brain is who you really are brought there's no way anyone could say they're at peace with just some parts of their brain being horribly damaged horribly embarrassed ruk chiral changes to their brain I don't think anyone's comfortable with any one of these locations of the brain being damaged by marijuana maybe I'm wrong send me email guys I'm waiting for that to come in alright so we continue here these changes strongly correlate with the monthly frequency of cannabis use in the three months before inclusion in the study specifically significant gray matter atrophy can occur either with a heavy cannabis consumption independent of the age of first use or with recreational consumption that started during adolescence before the age of eighteen neuropsychopharmacology come on that's a journal nobody can even spell the title is a terrible name for a journal how are we gonna sell any copies on newsstands with a title like that yeah well it's a respectable peer-reviewed journal that's what I was quoting before and that's what I'm interested in quoting again our findings corroborate several animal studies adding evidence that the duration of exposure to cannabis is indeed associated with localized volume reduction in regions rich in cb1 receptors correlating with the amount of cannabis used let me just let me just emphasize here mmm volume volume it doesn't mean doesn't mean they're turning down the volume in the brain it's not it's not about sound here okay localized volume reduction that's talking about the actual shrinkage of lobes of the brain okay the loss of gray matter being visible as shrinking hemispheres of the brain shall we say continue our conversation here the progression of them a long-term exposure to drugs toward the development of substance use disorders and addictive behaviors is often associated with deficits in decision-making in this regard that has been demonstrated that substance dependent individuals and patients with vmPFC lesions exhibits similar behaviors that lead them to make similar decisions in real life preferring choices that bring immediate benefits even if coupled with negative consequences thoughts so what they're saying here is the type of brain damage they have proven proven marijuana to cause it doesn't just show up in a brain scan on a computer screen down at the hospital it's also evident in changes in human behavior in the types of decisions people make this is a short clip from a 17 minute long video that provides much more detailed evidence about which parts of the brain are damaged in what way and the nature of the compelling scientific evidence for why and how we know this is along with some reflections on what it means to have a skeptical attitude if you just search within this channel you're going to find many videos bringing together evidence from many many scientific sources on this crucially important issue and now ask yourself why is it that Jacqueline Glenn on her side of the argument has no scientific sources at all she only has lies insults and innuendo people like to disrespect my truth the fact is that you know my name is I don't know you