JERUSALEM (Reuters) - Israeli soldiers traumatised by battle with the Palestinians have a new, unconventional weapon to exorcise their nightmares -- marijuana. Under an experimental programme, Delta-9 tetrohydrocannabinol (THC), the active ingredient found in the cannabis plant, will be administered to 15 soldiers over the next several months in an effort to fight post-traumatic stress disorder. Raphael Mechoulam of Jerusalem's Hebrew University, the chief researcher behind a project he described as a world-first, said the chemical could trick the brain into suppressing unwanted memories. For soldiers haunted by flashbacks of traumatic battle experiences, he said, the drug, administered in liquid...