NILSSON , KENT W., LARS ORELAND, ROBERT KRONSTRAND, and JERZY LEPPERT. “Smoking As a Product of gene–environment Interaction”. Upsala Journal of Medical Sciences 114, no. 2 (July 12, 2009): 100-107. Accessed April 8, 2026. https://ujms.net/index.php/ujms/article/view/6346.