| use of tobacco products and gastrointestinal morbidity: an endoscopic population-based study (the kalixanda study). | the impact of snus (smokeless tobacco or snuff) on gastrointestinal symptoms and pathological findings is largely unknown. the authors aimed to investigate whether the exposure to different forms of tobacco influences upper gastrointestinal symptoms, histology and frequency of helicobacter pylori infection. a random sample (n = 2,860) of the adult population of two northern swedish municipalities kalix and haparanda (n = 21,610) was surveyed between december 1998 and june 2001 using a validated ... | 2010 | 20668918 |