Smoking and IBD

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 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.

The relationship between smoking and Crohn's Disease and Ulceratice Colitis (the two main forms of Inflammatory Bowel Diseae - IBD) 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, people who smoke are less likely to develop Ulcerative Colitis, although it’s important to remember that smoking still carries many other health risks.

This information looks at the evidence for the different effects of tobacco 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 stop smoking.

Smoking and Crohn's Disease
Smoking and Ulcerative Colitis
Can I get help to give up smoking?
Help and support from Crohn's & Colitis UK
Other useful organisations
How we write our information

Last reviewed: November 2017