[1] Brown Univ, Ctr Alcohol & Addict Studies, Providence, RI 02912 USA
[2] Rhode Isl Hosp, Div Behav Genet, Providence, RI USA
[3] Univ So Calif, Keck Sch Med, Dept Prevent Med, Los Angeles, CA 90033 USA
[4] Univ So Calif, Keck Sch Med, Dept Psychol, Los Angeles, CA 90033 USA
[5] Legacy, Schroeder Inst Tobacco Res & Policy Studies, Washington, DC USA
[6] Brown Univ, Dept Psychiat & Human Behav, Providence, RI 02912 USA