title: Concurrent use of tobacco and khat: added burden on chronic disease epidemic.
authors.forename: Mustafa
authors.initials: M
authors.lastname: al'Absi
authors.forename: John
authors.initials: J
authors.lastname: Grabowski
mesh_terms: D029754:Catha / Q000009:adverse effects*; D000697:Central Nervous System Stimulants / Q000009:adverse effects*; D002908:Chronic Disease; D017281:Cost of Illness; D006801:Humans; D012907:Smoking / Q000009:adverse effects*; D019966:Substance-Related Disorders / Q000150:complications*
chemical_list: D000697:Central Nervous System Stimulants