title: The hardening hypothesis: does it matter?
authors.affiliation: UK Centre for Tobacco Control Studies, University of Nottingham, City Hospital, Nottingham NG5 1PB, UK. graeme.docherty@nottingham.ac.uk
authors.forename: Graeme
authors.initials: G
authors.lastname: Docherty
authors.forename: Ann
authors.initials: A
authors.lastname: McNeill
mesh_terms: D001294:Attitude to Health; D006801:Humans; D015995:Prevalence; D012907:Smoking / Q000453:epidemiology / Q000523:psychology; D016540:Smoking Cessation / Q000379:methods* / Q000523:psychology; D000074606:Smoking Prevention; D014029:Tobacco Use Disorder / Q000453:epidemiology / Q000523:psychology; D017211:Treatment Failure