Somalia - Khat (Qat)

Although technically not dangerous by itself, most of the gunmen cruising around the country have that tweaky, faraway look that sends chills down the spine of visitors. Khat is also one of the underpinnings of the economy here resulting in the occasional shootout over territory or delivery routes. Those who don't fight battles or raise camels grow khat, an amphetamine-like stimulant that, when chewed, provides a mild high. Khat is preferred fresh, and Federal Express would be green with envy to watch the bundles of khat being airfreighted out of Mogadishu to Yemen and the Gulf States. Khat can also be used as a form of currency.

http://www.sas.upenn.edu/African_Studies/Hornet/qat.html