C. L. Steinmiller, PhD, C. Diederichs, BS, T. A. Roehrs, PhD, M. Hyde-Nolan, MS, T. Roth, PhD, and M. K. Greenwald, PhD, “Postsurgical patient-controlled opioid self-administration is greater in hospitalized abstinent smokers than nonsmokers”, J of Opioid Management, vol. 8, no. 4, pp. 227–235, Jul. 2012.