Khat leaves are cultivated in the highlands of the Horn of Africa, Southern Arabia and along the East African coast. In parts of Ethiopia, Kenya, Somalia and Yemen, khat leaves\ud have been chewed for centuries for their mildly stimulating properties and are for many a regular part of social life. Traditionally, khat was used mostly by men during highly ritualised communal ‘khat parties’. Within about one hour, the user experiences physiological excitation and euphoria.\ud This is followed by a quieter, more introvert phase, giving way to a gradual comedown, which may include restlessness, irritability and melancholia
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