Smoking marijuana is often too 'narrow' the brain. This alarm of Australian researchers from the University of Melbourne, that a prolonged and frequent use of cannabis leads to a real shrinkage of certain brain areas. And especially those delegated to the memory, emotion and aggression. The discovery came by comparing the images of high resolution magnetic resonance imaging taken at the brains of 15 marijuana smokers, who consumed at least five joints a day for 10 years, and others who do not had ever used cannabis. In particular, the hippocampus, the 'central' memory and feeling, was smaller on average by 12%. While the amygdala that 'manages' anger and aggression had a volume of less than 7.1%. Because marijuana users were all moderate drinkers of alcohol, and had used other drugs more than 10 times in 10 years taken into account "the effects on the brain are directly attributable to cannabis," sentenced to the scientists, writers of a study published on the Archives of General Psychiatry. And the consequences of brain shrinkage were certified by the researchers, through the memory test, which showed that smokers of cannabis have a short memory and long-term worse than others. "Although the sample of marijuana users had a mean age of 39 years, the memory performance of 55-were those aged over 60," says study coordinator, Murat Yucel. What's more, warns the psychiatrist: "These people are more prone to psychotic symptoms such as paranoia or social isolation." And to further clarify the direct relationship between cannabis smoking and effects on brain volume, the scientists stressed that "the more one uses marijuana, the greater the effect of brain shrinkage."
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