effect of chewing qat on mucosal histology and prevalence of helicobacter pylori in the oesophagus, stomach and duodenum of yemeni patients.this investigation was aimed at assessing whether the yemeni habit of chewing qat on a regular basis had a significant effect on the upper alimentary tract. seventy patients with dyspepsia attending al-thawra hospital in taiz, yemen republic were examined by endoscopy. biopsies were taken from the oesophagus, stomach and duodenum. the patients included 28 who gave a history of daily qat intake, 21 with less frequent intake and 21 who took none. the only statistically significant finding associat ...19911757083
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