In "Black Hawk Down" as they prepare to go in to Mogadishu and nab the bad guys they talk about the locals being all jacked up on khat. Must be pretty common in that part of the world.
Khat is easily available in the U.S. - "If you are in a community with Somalian immigrants, khat is coming.............". - U.S. Customs seized 3.6 tons of khat during Ramadan alone during 2002....
Khat is common usage among most Asian immigrants who are mostly Muslim.