It helps the brain in a few ways. It protects it, can regenerate dead brain cells and helps neurons transmit at a steady pace which prevents seizures. http://norml.org/component/zoo/category/cannabis-and-the-brain-a-user-s-guide http://blog.norml.org/2013/06/06/studies-cannabinoids-protect-the-brain-and-heart-from-injury/ http://blog.norml.org/2013/08/27/study-thc-increases-brain-activity-in-response-to-positive-stimuli/