Contrary to long-held opinion, ecstasy, the popular rave-culture drug, does not harm your brain.This is according to one of the largest studies ever conducted on the illegal drug's effect on cognition, published last week in the journal Addiction. Though former studies have concluded quite the opposite about the drug (technical name 3,4-Methylenedioxymethamphetamine, or MDMA ) there's been concern that these conclusions were overstated and reached through faulty methods.