NEW YORK – A small study of casual marijuana smokers has turned up evidence of changes in the brain, a possible sign of trouble ahead, researchers say.
The young adults who volunteered for the study were not dependent on pot, nor did they show any marijuana-related problems.
“What we think we are seeing here is a very early indication of what becomes a problem later on with prolonged use,” things like lack of focus and impaired judgment, said Dr. Hans Breiter, a study author.
Longer-term studies will be needed to see if such brain changes cause any symptoms over time, said Breiter, of the Northwestern University Feinberg School of Medicine and Massachusetts General Hospital.
Previous studies have shown mixed results in looking for brain changes from marijuana use, perhaps because of differences in the techniques used, he and others noted in Wednesday’s issue of the Journal of Neurosciences
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