Smoking and IBD

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If you have Ulcerative Colitis or Crohn’s Disease and are a smoker, you may wonder whether this has an effect on your disease.

The relationship between smoking and Crohn's and Colitis is complex. Many studies have shown that people who smoke are more likely to develop Crohn’s Disease, and research suggests that smoking increases the severity of the disease. In contrast, smoking appears to decrease the severity of Ulcerative Colitis, although it still carries many other health risks.

This information sheet looks at the evidence for the different effects of smoking on these two conditions, and what it may mean for people with Crohn's or Colitis. It also looks at ways to help you give up smoking.