Researchers at Northwestern University have released a study that says marijuana can have a permanent impact on the brain even if only used recreationally. The study says that even causal marijuana ... more 
Researchers at Northwestern University have released a study that says marijuana can have a permanent impact on the brain even if only used recreationally. The study says that even causal marijuana users showed changes in brain patterns in the brain less 
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WGAL - Lancaster/Harrisburg
Thu, Apr 17, 2014 7:40 AM EDT