Khat use has traditionally been confined to the regions where Khat is grown, because only fresh Khat picked within 48 hours did have the desired stimulating effects. In recent years improved roads, off-road motor vehicles and air transport have increased its global distribution.
Khat leaves are chewed for stimulant and euphoriant effects and are used to treat obesity and prevent hunger in areas with meager food supplies. Some users experience dysphoria and sedation. Chewing khat leaves results in reduction in maximum and average urinary flow rates.