Several recent studies have suggested that smoking marijuana is associated with physical changes in certain regions of the brain, both in terms of shape and volume, although they could not establish cause and effect. Now, new research which set out to replicate these investigations using a more robust experimental design has produced conflicting results. According to the study, daily marijuana use, in both adults and adolescents, is not associated with any significant differences in either the shape or volume of the regions investigated. The work has been published in The Journal of Neuroscience.
http://www.iflscience.com/brain/new-study-finds-daily-marijuana-use-not-associated-brain-changes, 29.1.2015
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