CHUDZIK, Robert, RYBOJAD, Beata and RYBOJAD, Paweł. The number of passively smoked cigarettes and the risk of lung cancer among the inhabitants of the Lubelskie Region (2013-2017). Journal of Education, Health and Sport. Online. 10 September 2020. Vol. 10, no. 9, pp. 248-255. [Accessed 21 July 2024]. DOI 10.12775/JEHS.2020.10.09.027.