Mathew AR, Bhatt SP, Colangelo LA, Allen NB, Jacobs DR, Auer R, Dransfield MT, Hitsman B, Washko GR, Kalhan R. Life-Course Smoking Trajectories and Risk for Emphysema in Middle Age: The CARDIA Lung Study. Am J Respir Crit Care Med 2019;199(2):237-240.