Commentary on “Smoking negatively affects renal cell carcinoma overall and cancer-specific survival.” Kroeger N, Klatte T, Birkhäuser FD, Rampersaud EN, Seligson DB, Zomorodian N, Kabbinavar FF, Belldegrun AS, Pantuck AJ, Institute of Urologic Oncology, David Geffen School of Medicine at the University of California-Los Angeles, Los Angeles, CA