“…2 However, data from country-specific populations are poorly comparable, since they are not collected using a standardized study design-including sampling methods, mode of interviewing and questionnaires-which represents a prerequisite for valid comparisons of smoking prevalence and smoking patterns across different countries. 3,4 To the best of our knowledge, the only standardized and representative investigations that systematically monitor smoking prevalence among adults in more than one European country, are the WHO Global Adult Tobacco Survey (GATS) 5,6 ; the Survey of Health, Ageing and Retirement in Europe (SHARE) 7 ; and the European Commission (EC) Special Eurobarometers. [8][9][10] GATS covers three European Union (EU) member states (MS; ie, Greece, Poland, and Romania) 5,6 ; SHARE is a longitudinal study, conducted in five waves between 2004 and 2013, collecting information on smoking habit among individuals aged 50 years and older from 20 European countries 7 ; Eurobarometer is a representative survey conducted in all the 28 EU MS on approximately 1,000 face-to-face interviews per country, based on selected thematic studies.…”