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Individuals smoking one pack each day would consume more than 131 million crocidolite fibers per year

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Around 80% of the adult population chews the leaves - which induce a state of euphoria - and the market stalls of the capital Sanaa carry marketing slogans such as Chew and relax, and success will come to you. Leaves from these qat trees in Thila, just outside of Sana'a,-are harvested and transported to Sana'a-to be sold 1 of 6 Qat has been grown for use as a stimulant for centuries in the Horn of Africa and the Arabian Peninsula