Khat or Catha edulis, is a flowering plant most commonly found in countries of the African Horn and the Arabian Peninsula. Khat chewing goes far back in history and has always been a kind of tradition in some of these countries.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3991038/
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Khat is a natural stimulant from the Catha edulis plant that is cultivated in the Republic of Yemen and most of the countries of East Africa. Its young buds and tender leaves are chewed to attain a state of euphoria and stimulation.1 Khat is an evergreen shrub, which is cultivated as a bush or small tree. The leaves have an aromatic odor