Khat is an evergreen shrub that grows wildly and is native to the horn of Africa and the Arabian Peninsula. Khat grows best at an altitude of 5,000-8,000 feet and can grow as high as 80 feet in equatorial climate. About 20 million people who live mostly in these two regions chew its fresh young leaves for it's psychostimulant effect. Khat chewing is deeply ingrained in their society and culture (done largely as a social activity) and is usually accompanied by a drink, since users experience dryness of the mouth.