RT Article T1 What is the evidence for hardening in the cigarette smoking population? Trends in nicotine dependence in the U.S., 2002-2012 JF Drug and alcohol dependence VO 142 SP 333 OP 340 A1 Smith, Philip H. A2 McKee, Sherry A. A2 Giovino, Gary A. A2 Mazure, Carolyn M. A2 Rose, Jennifer S. LA English YR 2014 UL https://krimdok.uni-tuebingen.de/Record/191274760X