The study discovered that smoking increases the risk of recurrent colorectal polyps and cancer in people with inflammatory bowel disease. The study included 576 individuals with long-term ulcerative colitis or Crohn’s disease who were part of a colonoscopy monitoring program. With a median of 9 pack-years of smoking, over half of the patients were current or past smokers. 105 individuals acquired recurrent colorectal neoplasia after a median of 5 years of follow-up. While never smoking was not connected with an elevated risk, the researchers discovered a clear dose-response connection, with a larger number of pack-years of smoking being associated with a 17% increased risk of recurrent colorectal neoplasia. This implies that smoking more intensively and for longer periods of time increases the risk.

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