[1] Harvard Univ, Massachusetts Gen Hosp, Sch Med, Dept Psychiat, Boston, MA 02114 USA
[2] Harvard Univ, Sch Med, Mongan Inst Hlth Policy, Boston, MA 02114 USA
[3] Massachusetts Gen Hosp, Dept Med, Tobacco Res & Treatment Ctr, Boston, MA 02114 USA
[4] Massachusetts Gen Hosp, Div Thorac Surg, Boston, MA 02114 USA
[5] Arkansas Dept Hlth, Tobacco Prevent & Cessat Program, Little Rock, AR 72205 USA