METHODS

Data sources:

Studies were identified by searching Medline (1966–2003), CINAHL (1982–2003), EMBASE/Excerpta Medica (1980–2003), the Cochrane Controlled Trial Register (2003), Science Citation Index (2003), PsycLIT (1971–2003), Dissertation Abstracts (1861–2003), Bath Information and Data Services Index to Scientific and Technical Proceedings (1982–2000), the United Kingdom National Research Register (2003), reference lists of retrieved articles, contact with experts, the Prospective Studies Collaboration, and any relevant publications. Search strategies included terms for CHD, smoking cessation or smoking, and mortality. MeSH terms from the Cochrane randomised …