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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.
Smoking increases your risk of developing macular degeneration two to 5 times! If you have a family history of AMD and your genes contain a certain âcomplement factorâ, your smoking is increasing your risk up to 200 fold.