Michael K. Ong, Allison L. Diamant, and Qiong Zhou are with the Division of General Internal Medicine and Health Services Research, Department of Medicine, David Geffen School of Medicine, University of California, Los Angeles. Hye-Youn Park is with the California Tobacco Control Program, California Department of Public Health, Sacramento. Robert M. Kaplan is with the Department of Health Services, School of Public Health, University of California, Los Angeles.