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Cannabis, alkohol och vit hjärnsubstans
En studie från 2012 visar att bruk av enbart cannabis inte påverkar den vita hjärnsubstansen
negativt [57] . Enbart alkohol ger dock en negativ förändring och en annan studie visar även en
synergieffekt om alkohol kombineras med cannabis [58] :
A teen who consumes alcohol is likely to have reduced brain tissue health, but a teen
who uses marijuana is not, according to a new study.
“
Researchers scanned the brains of 92 adolescents, ages 16 to 20, before and after an
18-month period. During that year and a half, half of the teens -- who already had
extensive alcohol and marijuana-use histories -- continued to use marijuana and
alcohol in varying amounts. The other half abstained or kept consumption minimal,
as they had throughout adolescence.
The before-and-after brain scans of the teens consuming typically five or more drinks
at least twice a week showed reduced white matter brain tissue health, study coauthor
Susan Tapert, neuroscientist at University of California, San Diego, told
HuffPost. This may mean declines in memory, attention, and decision-making into
later adolescence and adulthood, she said.
However, the level of marijuana use -- up to nine times a week during the 18 months
-- was not linked to a change in brain tissue health. The researchers did not test
performance; they only looked at brain scans.
— Huffington Post 2002-12-21 [59]
”
Man kan notera att det är sällsynt att media varnar för att alkoholdoserna som är vanligt
förekommande i ungdomarnas festkultur leder till hjärnskador...
Hjärnskador och kognitiva skador är annars mycket vanligt förekommande bland brukare och
missbrukare av alkohol [60][61] .
Läsvärt
Kapitel 9 "Does cannabis cause lasting brain damage" i boken Marijuana and Madness
Fler studier om cannabis påstådda neurotoxicitet samt motargument: Are Cannabinoids Neurotoxic?
by Bilzor, edited by Austior
Källor
1. ↑ BBC: On This Day 2 1974: Cannabis causes brain damage
2. ↑ 2,0 2,1 The Emperor Wears No Clothes av Jack Herer
3. ↑ J. W. Harper, R. G. Heath, W. A. Myers. Effects of Cannabis Sativa on Ultrastructure of the Synapse in Monkey Brain.
Journal of Neuroscience Research Vol. 3 pp. 87-93. (1977)
4. ↑ R. G. Heath, A. T. Fitzjarrell, R. E. Garey, W. A. Myers. Chronic Marihuana Smoking Its Effects on Function and
Structure of the Primate Brain. Marihuana: Biological Effects Analysis, Metabolism, Cellular Responses,
Reproduction and Brain Gabriel G. Nahas, W. D. M. Paton ed. pub. Pergamon Press Oxford (1979)
5. ↑ Heath, R.G., A.T. Fitzjarrell, C.J. Fontana, and R.E. Garey. Cannabis sativa: Effects on brain function and
ultrastructure in Rhesus monkeys. (1980)
6. ↑ 6,0 6,1 A Critical Review Of The Research Literature Concerning Some Biological And Psychological Effects Of
Cannabis (Nelson, 1993)
7. ↑ [William Slikker et al "Behavioral, Neurochemical, and Neurohistological Effects of chronic Marijuana Smoke
Exposure in the Nonhuman Primate", pp219-74 in l. Murphy and A. Bartke (eds), Marijuana Neurobiology and
Neurophysiology, Boca Raton: CRC press (1992)]
8. ↑ Syed F. Ali, Glenn D. Newport, Andrew C. Scallet, Merle G. Paule, John R. Bailey, William Slikker, Jr. "Chronic
Marijuana Smoke Exposure in the Rhesus Monkey IV Neurochemical Effects and Comparison to Acute and Chronic
Exposure to Delta-9-Tetrahydrocannabinol (THC) in Rats" Pharmacology, Biochemistry & Behavior, 40: 677-682.
(1991)
9. ↑ Charles Rebert & Gordon Pryor - Chronic Inhalation of Marijuana Smoke and Brain Electrophysiology of Rhesus
Monkeys, International Journal of Psychophysiology V 14, p.144. (1993)
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