Reply to Michael Froehner, Rainer Koch, Manfred P. Wirth's Letter to the Editor re: Malte Rieken, Shahrokh F. Shariat, Luis A. Kluth, et al. Association of Cigarette Smoking and Smoking Cessation with Biochemical Recurrence of Prostate Cancer in Patients Treated with Radical Prostatectomy. Eur Urol. In press. http://dx.doi.org/10.1016/j.eururo.2015.05.038.