There is a paucity of evidence on the factors associated with low-SES populations retention in smoking cessation studies.

This study is the first to ascertain which factors were associated with retention of low-SES smokers in a smoking cessation trial and to examine the association between smoking-related, health-related, behavioural, sociodemographic and recruitment source and retention.

This paper identified a high retention rate of 84%.

Rigorous reminders and participant reimbursement can prevent high attrition rates in low-SES populations.