Table 1.

Systematic search and data extraction specification

Main intervention types	Price and taxation measures; smoke-free policies; mass media campaigns; sales and marketing controls; population-level cessation support
Smoking-related outcome measures	Smoking prevalence and consumption; quit behaviours and success; intermediate outcomes (eg, awareness and attitudes); secondhand smoke exposure and smoke-free coverage; retailer density and compliance
SES indicators	Individual measures (eg, education, income and occupational group); area-based measures (eg, neighbourhood affluence or deprivation, poverty, median household income)
Bibliographic databases	ASSIA; BIOSIS; CINAHL Plus; Cochrane Library; EMBASE; IBSS; Medline; PsycINFO; Sociological Abstracts; Web of Science Core Collection
Online journals (for hand-search)	Addiction; Nicotine & Tobacco Research; Social Science & Medicine; Tobacco Control
Data extraction items	Intervention details; research design; geographical location; data collection period; sample characteristics; smoking-related outcomes; SES indicators

SES, socioeconomic status.