Active smokers were defined as individuals who smoked at least 1 cigarette per day at the time of diagnosis and that continued smoking during the follow-up. Former smokers were defined as those patients who had stopped smoking before the diagnosis of IBD.
Se denominó fumador activo al individuo que fuma al menos 1 cigarrillo al día al momento del diagnóstico y que continúa fumando durante el seguimiento, y ex tabaquismo a aquellos pacientes que habían dejado de fumar antes del diagnóstico de enfermedad inflamatoria intestinal.