1 Smoking Prevention/Cessation Center (CPCT), Institute of Internal Medicine, Azienda Ospedaliero-Universitaria "Policlinico-Vittorio Emanuele", University of Catania, Catania, Italy polosa@unict.it.
2 Smoking Prevention/Cessation Center (CPCT), Institute of Internal Medicine, Azienda Ospedaliero-Universitaria "Policlinico-Vittorio Emanuele", University of Catania, Catania, Italy.