Letter: smoking as a modifiable risk factor for a complicated course in Crohn's disease. Authors' reply

We would like to thank our colleagues from Leeds for their interest in our manuscript,1, 2 recently published in Alimentary Pharmacology and Therapeutics. One of the striking findings of our survey was indeed the limited awareness of the risks of smoking in our patients with Crohn's disease. Overall, 37% of 575 patients who filled out the questionnaires were aware of a link between active smoking and Crohn's disease, while 30% of them recognised...