4) Smoking
The incidence of Crohn’s disease is higher among smokers; thus, smoking increases the risk of Crohn’s disease.
The incidence of ulcerative colitis is lower among smokers. 80% of patients with ulcerative colitis are nonsmokers.
The incidence of Crohn’s disease is higher among smokers; thus, smoking increases the risk of Crohn’s disease.
The incidence of ulcerative colitis is lower among smokers. 80% of patients with ulcerative colitis are nonsmokers.
