Khat. A harmless natural stimulant or a lethal epidemic sweeping through the international drugs trade? Khat is a natural substance that, in the Middle East, is as ubiquitous as coffee is in the West. It is hugely popular in some African and Arab populations. But critics contend that it is a seriously addictive stimulant that damages the cardiovascular system. In a groundbreaking study, the authors go behind the veil of the drug, questioning its availability and its effect on its Red Sea p...