This is a shrub or small tree that grows wild and is largely cultivated in the uplands of Yemen and East Africa. The plant is known under many names; it is called qat in Yemen, tschad in Ethiopia, and miraa in Kenya. The botanical name is Catha edulis. Khat is a habituating stimulant containing ALKALOIDS released by chewing the leaves, buds, and sprouts. The leaves are about two to three inches long, with a serrated edge (see Figure 1), are brownish-green, somewhat leathery, and have a glossy upper surface. Since these plants lack more specific botanical features, a chromatographic test for their identification has been developed.

Use.

Khat leaves can be made into a tea, but generally they are chewed for their stimulating effect. They are thoroughly masticated one by one; the juice is swallowed while their residue is stored in the cheek and later ejected. Young leaves are...