http://www.webmd.com/smoking-cessation/ ... y-suggestsLong-term cannabis users don't seem to show genuine cognitive deficits despite these minor brain structure anomalies.
http://www.ncbi.nlm.nih.gov/pubmed/22731735Overall, these meta-analyses demonstrate that any negative residual effects on neurocognitive performance attributable to either cannabis residue or withdrawal symptoms are limited to the first 25 days of abstinence. Furthermore, there was no evidence for enduring negative effects of cannabis use.
Думал, что есть какие-то фундаментальные исследования, доказывающие вред марихуны, но теперь такое публикуют webmd и nih...