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Background and study aims  Currently, there are no studies conducted in the Kingdom of Saudi Arabia (KSA) that have assessed the relationship between ulcerative colitis (UC) flare-ups and smoking. The present study aims to assess the risk of UC flare-ups and evaluate the relationship between UC flare-ups and smoking in adult patients following up at King Abdulaziz University Hospital in Jeddah, KSA.  Patients and methods  This was a retrospective study involving patients with confirmed UC between January 2015 and December 2020. Various information was examined, including demographic, clinical, endoscopic, radiologic, and laboratory data. Descriptive statistics were used for summarizing findings and a logistic regression analysis was applied to test for possible associations.  Results  Eighty-nine patients with UC were included in the study. Almost half (48.3%) had recurrent UC flare-ups during follow-up. A non-significant relationship was found between recurrent UC flares and all types of smoking habits (cigarette smoking,  P  = 0.15; shisha smoking,  P  = 0.88; and vape smoking,  P  = 0.09). Participants who were underweight ( P  = 0.041), had family history of UC ( P  = 0.013), depression ( P  = 0.033), fecal incontinence ( P  = 0.003), iron deficiency anemia ( P  = 0.009), or a malignancy ( P  = 0.039) had a significantly higher probability of experiencing recurrent flares. Binary logistic regressions revealed that family history of UC (OR = 5.3,  P  = 0.007) and fecal incontinence (OR = 4.7,  P  = 0.006) were associated significantly with recurrent flares.  Conclusion  There was no clear association between smoking and recurrent UC flares identified in this cohort. Of the variables considered, UC patients with fecal incontinence or family history of UC were at the highest risk of developing recurrent flares.

Factors Affecting Ulcerative Colitis Flare-Ups: Associations With Smoking Habits and Other Patient Characteristics