1 Armando Peruga and Esteve Fernández are with the Tobacco Control Unit, Cancer Prevention and Control Programme, Institut Català d'Oncologia/Institut d'Investigació Biomèdica de Bellvitge (ICO/IDIBELL), L'Hospitalet de Llobregat, Barcelona, Spain. Armando Peruga is also with the Center for Epidemiology and Health Policies, School of Medicine Clínica Alemana, Universidad del Desarrollo, Región Metropolitana, Chile. Esteve Fernández is also with the Center for Biomedical Research in Respiratory Diseases, Instituto de Salud Carlos III, Madrid, Spain.