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Contributors MW and MS co-designed the study and MB coordinated fieldwork and undertook data analysis. All authors contributed to manuscript writing and revisions and approved the final version of the paper.
Funding This study was supported by Quit Victoria, Cancer Council Australia, Cancer Council South Australia, Cancer Council Victoria, Cancer Research UK, Fresh, Smoke-free Southwest, Tobacco-Free Futures and Action on Smoking and Health (UK).
Competing interests None.
Ethics approval Institutional Research Review Committee, Cancer Council Victoria.
Provenance and peer review Not commissioned; externally peer reviewed.
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