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High-strength cannabis may damage nerve fibers that handle the flow of messages across the two halves of the brain, scientists claim.
Brain scans of people who regularly smoked strong skunk-like cannabis revealed subtle differences in the white matter that connects the left and right hemispheres and carries signals from one side of the brain to the other.
The changes were not seen in those who never used cannabis or smoked only the less potent forms of the drug, the researchers found.
Paola Dazzan, a neurobiologist at the Institute of Psychiatry at King’s College London, said “It is possible that these people already have a different brain and they are more likely to use cannabis. But what we can say is if it’s high potency, and if you smoke frequently, your brain is different from the brain of someone who smokes normal cannabis, and from someone who doesn’t smoke cannabis at all.”
Dazzan and others at the Institute of Psychiatry reported that the ready availability of skunk might be behind a rise in the proportion of new cases of psychosis.
http://www.theguardian.com/science/2015/nov/27/smoking-high-strength-cannabis-skunk-may-damage-nerves-brain