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1.  Association of Khat Chewing With Increased Risk of Stroke
and Death in Patients Presenting With Acute Coronary Syndrome 
Mayo Clinic Proceedings  2010;85(11):974-980. OBJECTIVE: To
evaluate the prevalence and significance of khat chewing in
patients with acute coronary syndrome (ACS). PATIENTS AND
METHODS: From January 29, 2007, through July 29, 2007, 8176
consecutive patients presenting with ACS were enrolled in a
prospective, multicenter study from 6 adjacent Middle Eastern
countries. RESULTS: Of the 8176 study patients, 7242 (88.6%)
were non-khat chewers, and 934 (11.4%) were khat chewers, mainly
of Yemeni origin. Khat chewers were older (57 vs 56 years;
P=.01) and more likely to be men (85.7% vs 74.5%) compared with
non-khat chewers. Non-khat chewers were more likely to have
diabetes mellitus, hypertension, dyslipidemia, obesity, and
prior history of coronary artery disease and