give me a physiological or mechanistic explination of this "pot fog". not some "these retards who cant remember anything happen to be pot users" correlational psychology study
ya know, sort of like the numerous studies on brain deterioration with alcohol, as well as the fact that it is proven to be physically addictive, while marijuana isnt...
The Neuropathology of Alcohol-specific Brain Damage, or Does Alcohol Damage the Brain?
"There is still debate as to whether alcohol per se causes brain damage. The main problem has been to identify those lesions caused by alcohol itself and those caused by other common alcohol-related factors, principally thiamin deficiency. Careful selection and classification of alcoholic cases into those with and without these complications, together with detailed quantitative neuropathological analyses, has provided us with useful data. There is brain shrinkage in uncomplicated alcoholics which can largely be accounted for by loss of white matter. Some of this damage appears to be reversible. However, alcohol-related neuronal loss has been documented in specific regions of the cerebral cortex (superior frontal association cortex), hypothalamus (supraoptic and paraventricular nuclei), and cerebellum. The data is conflicting for several regions: the hippocampus, amygdala and locus ceruleus. No change is found in the basal ganglia, nucleus basalis, or serotonergic raphe nuclei. Many of the regions that are normal in uncomplicated alcoholics are damaged in those with the Wernicke-Korsakoff syndrome. Dendritic and synaptic changes have been documented in uncomplicated alcoholics and these, together with receptor and transmitter changes, may explain functional changes and cognitive deficits that precede the more severe structural neuronal changes. The pattern of damage appears to be somewhat different and species-specific in animal models of alcohol toxicity. Pathological changes that have been found to correlate with alcohol intake include white matter loss and neuronal loss in the hypothalamus and cerebellum."
HARPER, CLIVE MD, FRCPA 1998 American Association of Neuropathologists, Inc
1) I'm arguing against pot. I'm not arguing alcohol can't do damage. Did you forget what we were posting about? I had a couple of glasses of wine tonight, and I still remember the topic at hand.
2) Here's one (of many) studies that isn't "correlational" (as you put it):
Drug Alcohol Depend. 2011 Apr 1;114(2-3):242-5. Epub 2010 Nov 2.
Diminished gray matter in the hippocampus of cannabis users: Possible protective effects of cannabidiol.
Demirakca T, Sartorius A, Ende G, Meyer N, Welzel H, Skopp G, Mann K, Hermann D.
Department of Neuroimaging, Central Institute of Mental Health, J 5, 68159 Mannheim, Germany.
Abstract
BACKGROUND: Chronic cannabis use has been associated with memory deficits and a volume reduction of the hippocampus, but none of the studies accounted for different effects of tetrahydrocannabinol (THC) and cannabidiol (CBD).
METHODS: Using a voxel based morphometry approach optimized for small subcortical structures (DARTEL) gray matter (GM) concentration and volume of the hippocampus were measured in 11 chronic recreational cannabis users and 13 healthy controls, and correlated with THC and CBD from hair analyses. GM volume was calculated by modulating VBM using Jacobian determinants derived from the spatial normalization.
RESULTS: Cannabis users showed lower GM volume located in a cluster of the right anterior hippocampus (P(uncorr)=0.002; effect size Cohen's d=1.34). In a regression analysis an inverse correlation of the ratio THC/CBD with the volume of the right hippocampus (P(uncorr)p<0.001, Cohen's d=3.43) was observed. Furthermore Cannabidiol correlated positively with GM concentration (unmodulated VBM data), but not with GM volume (modulated VBM) in the bilateral hippocampus (P=0.03 after correction for hippocampal volume; left hippocampus Cohen's d=4.37 and right hippocampus 4.65).
CONCLUSIONS: Lower volume in the right hippocampus in chronic cannabis users was corroborated. Higher THC and lower CBD was associated with this volume reduction indicating neurotoxic effects of THC and neuroprotective effects of CBD. This confirms existing preclinical and clinical results. As a possible mechanism the influence of cannabinoids on hippocampal neurogenesis is suggested.
Copyright © 2010 Elsevier Ireland Ltd. All rights reserved.
PMID: 21050680 [PubMed - in process]