Inclusion Criteria for Articles in a Meta-Analysis

- Randomized control trial (RCT)
- Published in a peer review journal
- Published in English
- With noted exceptions, randomized at level of subject
- Data analysis done on an “intent to treat” basis
- Abstinence outcome reported at least 5 months after quit date or pre/post delivery for RCTs with pregnant smokers
- Biochemical verification of abstinence required for RCTs with pregnant women
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