"Longitudinal and twin studies report larger declines in IQ among cannabis users than their non-using peers but it is unclear whether these findings can be attributed to cannabis use or to genetic, mental health and environmental factors."
I think a very important part is:
> For example, I’m interested in the effects of THC versus CBD. We don't have any of that information in the UK Biobank. Most people in this study were using cannabis quite a while ago, and cannabis at that time looked very different from what’s available today. That context really matters. It’s a complex picture.
It's like having a bottle of beer vs bottle of whiskey. I don't exactly imbibe them in the same way, do I?
> However, another brain region saw lower volumes – suggesting the impact cannabis has on the brain is complex and nuanced, requiring further investigation.
> there was a single brain region where we saw that higher cannabis use was actually associated with lower brain volume – the posterior cingulate, which is part of the limbic system and is implicated in processes like memory, learning, and emotion. That said, some research suggests smaller posterior cingulate volume is actually associated with better working memory, so it’s a little unclear what this means.
Off the top of my head I can think of many socio-economic confounding variables, and also survivorship-bias.
throwa356262•1h ago
treetalker•41m ago