RT Article T1 What Is the Evidence for 'Hardening'? Trends in Nicotine Dependence in the United States, 2002-2011 [poster] A1 Smith, Philip H. A2 McKee, Sherry A. A2 Mazure, Carolyn M. A2 Giovino, Gary A. A2 Rose, Jenifer S. LA English PB NIH Office of Research on Women's Health YR 2014 UL https://krimdok.uni-tuebingen.de/Record/1912747618 K1 Konferenzschrift ; 2014 ; Bethesda, MD