The hardening hypothesis: is the ability to quit decreasing due to increasing nicotine dependence? A review and commentary.
Drug Alcohol Depend. 2011 Sep 1;117(2-3):111-7. doi: 10.1016/j.drugalcdep.2011.02.009. Epub 2011 Mar 15.
Drug Alcohol Depend. 2011.
PMID: 21411244
Free PMC article.
Review.