1. Department of Clinical and Experimental Medicine University of Catania Catania Italy
2. Center of Excellence for the Acceleration of HArm Reduction (CoEHAR) University of Catania Catania Italy
3. Respiratory Unit, University Hospital “Policlinico‐San Marco” University of Catania Catania Italy
4. Department of Respiratory Medicine, Harefield Hospital Guy's & St Thomas' NHS Foundation Trust Harefield UK
5. Centre for the Prevention and Treatment of Tobacco Addiction (CPCT), University Hospital "Policlinico‐S.Marco" University of Catania Harefield Italy