Anonymousabout 3 hours ago
The largest brain imaging studies on cannabis to date — including a 1,003-person fMRI study of young adults and a 26,362-person UK Biobank analysis of middle-aged and older adults — reveal a complex picture: younger heavy users show reduced brain activity during working memory tasks, while older users show larger brain volumes and better cognitive scores. The findings highlight that age of use, frequency, potency, and pre-existing conditions all shape outcomes, and that neither "cannabis is harmless" nor "any use is dangerous" captures the evidence.