Since the mid 2000′s researchers have been building an appreciation for the power of marijuana-like substances that make up the brain’s cannabinoid systems. In animal experiments, for example, synthetic compounds similar to THC—marijuana’s main psychoactive component—have shown promise in preserving brain functions. A 2008 study even demonstrated that a THC-like substance reduced brain inflammation and improved memory in older rats.

Read more: http://healthland.time.com/2012/10/29/how-cannabinoids-may-slow-brain-aging/#ixzz2NWaGC2J8