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Researchers have found that smoking can reduce the impact of some UC symptoms.

The results of a 10-year study from 1998 suggest that people who both smoke and have UC are less likely than people who do not smoke to require steroids to treat a relapse. They were also less likely to require surgery or develop serious complications.

Scientists are not why sure smoking has an impact on UC, but it is possible that there is a connection to the effect it has on the immune system.