Włodarska A, et al. - Because obstructive sleep apnea syndrome (OSAS) is the most common respiratory disturbance in sleeping children, researchers intended to determine if there is an association between exposure to tobacco smoke (passive smoking) and the development of respiratory disorders in children during sleep. Participants in the study were 160 school‐aged children (6–18 years). The criterion for inclusion was exposure to tobacco smoke at home (n  = 90). The control group included children of school age who had no interaction at home with smoke from tobacco (n = 70). Each child had performed a polygraphic examination at home. The study was conducted from December 15, 2012, until February 26, 2016. According to findings, OSAS was found in 12% of children with an apnea‐hypopnea index >1.5 (< 13 years of age) and an apnea‐hypopnea index > 5 (for children > 13 years), and with diurnal and nocturnal symptoms. OSAS occurs more frequently in children exposed to tobacco smoke and these children show to greater extent problems with concentration, tiredness, and irritability/hyperactivity than the control group. There were no statistically significant differences in waking up, snoring, or sleep apnea.