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Ethnicity â Although Crohnâs disease can affect any ethnic group, Caucasians and people of Eastern European (Ashkenazi) Jewish descent have the highest risk. American Jewish people of European descent are four to five times more likely to develop IBD than the general population.
If you have Crohnâs and smoke, you are likely to have more severe symptoms. People of European Jewish ancestry have an increased risk of Crohnâs, and African Americans have a decreased risk. However, the number of African Americans developing this disease seems to be increasing.