1 Lung Unit, The Champalimaud Center for the Unknown, Lisboa, Portugal; Pulmonology Department, Hospital Prof. Doutor Fernando Fonseca, Amadora, Portugal. Electronic address: claudia.pavao.matos@gmail.com.
2 Pulmonology Department, Hospital Prof. Doutor Fernando Fonseca, Amadora, Portugal; Working Committee on Smoking, Portuguese Society of Pulmonology, Lisboa, Portugal.
3 Pulmonology Department, Hospital Vila Franca de Xira, Vila Franca de Xira, Portugal; Working Committee on Smoking, Portuguese Society of Pulmonology, Lisboa, Portugal.
4 Pulmonology Department, Hospital de São João, Porto, Portugal; President of the Portuguese Society of Pulmonology, Lisboa, Portugal.