Background: The prevalence of smoking and contributing factors among Iranian university students has been paid littleattention.Aims: The aim of this study was to assess the prevalence of smoking in Iranian university students and its associationwith health-related behaviours.Methods: This cross-sectional study was carried out on a sample of 82 806 Iranian university students admitted in 2012–2013. Information on demographic characteristics and health-related behaviours, including physic...