title: Smoking and duodenal ulcer.
mesh_terms: D001639:Bicarbonates / Q000378:metabolism; D004381:Duodenal Ulcer / Q000453:epidemiology / Q000209:etiology*; D004386:Duodenum / Q000378:metabolism; D005744:Gastric Acid / Q000378:metabolism; D006801:Humans; D006863:Hydrogen-Ion Concentration; D010437:Peptic Ulcer / Q000453:epidemiology; D012307:Risk Factors; D012907:Smoking / Q000009:adverse effects* / Q000378:metabolism
chemical_list: D001639:Bicarbonates