Date	Event	Description
14 September 2016	New citation required and conclusions have changed	Minor changes to the conclusions include: Interventions which provide social (peer and partner) support to quit smoking no longer demonstrated a significant effect. While interventions continued to show that smoking cessation interventions can significantly reduce the proportion of infants born low birthweight (< 2500 g), there was no longer a significant difference in the proportion of infants born preterm (< 37 weeks' gestation). A new trial of 'exercise' compared to usual care has been included, but did not demonstrate an effect that was statistically significant. These changes are likely due to the inclusion of several large new trials as well as additional 'less intensive' study arms from previously included studies.
13 November 2015	New search has been performed	Search updated and 16 new studies (total n = 102 studies) included as well as 18 additional study arms from multi‐arm trials (n = 120 study arms). However, by time of publication of this review, new trials were identified which will be included in future updates.
1 March 2013	New search has been performed	For this update the review has been split into two reviews. Pharmacological interventions (with equal psychosocial support in both arms) are now covered in a separate review by Coleman 2015. For this update, the current review now covers all other interventions. The title has been changed from 'Interventions for promoting smoking cessation during pregnancy' to 'Psychosocial interventions for supporting women to stop smoking in pregnancy'. Search updated. We identified 16 new studies meeting the inclusion criteria. As a result of a change in the inclusion criteria we excluded 13 studies from the previous version of the review. We also included four studies that had been previously excluded (three cluster trials and one abstract report of a trial), as well as nine studies that did not report any outcomes which could be used in meta‐analyses, and which are reported in a separate table. We combined two reports of relapse prevention (Ershoff 1995; Secker‐Walker 1995) as ‘Associated References’ to the primary papers reporting smoking cessation (Ershoff 1989; Secker‐Walker 1994), and another paper which did not report any usable outcomes (Solomon 1996) as an 'Associated reference' to the primary report (Secker‐Walker 1998). A total of 77 randomised controlled trials, involving over 29,000 women with relevant outcome data, were included in the meta‐analysis for this review (primary outcome data for 21,948 women participating in 70 trials and secondary outcome data only for a further 7404 women participating in seven trials). A further nine trials without outcomes are included but results summarised in Table 4, making a total of 86 studies included in this updated review.
1 March 2013	New citation required but conclusions have not changed	This review has been updated. The overall conclusions about the effectiveness of smoking cessation interventions have not changed.
17 November 2008	New citation required but conclusions have not changed	Two new authors have joined the review team for this substantive update, which includes the addition of risk of bias assessments for all trials; additional outcomes tables for smoking reduction, continued cessation in the postnatal period, neonatal intensive care unit admissions, psychological impacts of smoking, views of participants and providers; inclusion of additional data from previously included cluster‐randomised trials; and risk of bias sensitivity analysis.
17 November 2008	New search has been performed	Search updated: 7 new randomised controlled trials (Cope 2003; Dornelas 2006; Heil 2008; Higgins 2004; Hotham 2005; Pollak 2007; Rigotti 2006) and 4 cluster randomised controlled trials (Campbell 2006; McLeod 2004; Pbert 2004; Polanska 2004) included. Mullen 1991 and Hughes 2000 previously included have now been excluded.
3 November 2008	Amended	Converted to new review format.
31 July 2003	New search has been performed	We have updated the Background and Results sections (comment on the differences between the interventions when trials are grouped by intervention). Twenty new trials reporting smoking cessation were included with five additional cluster‐randomised trials. Nine additional trials were excluded. Six trials provided new data on fetal and perinatal outcomes. The overall conclusions about the effectiveness of smoking cessation interventions did not change. New analyses grouping interventions by strategies showed that the pooled cognitive‐behavioural interventions were effective, nicotine replacement therapy was borderline, and trials using 'stages of change' approaches or feedback were not effective. The two trials using a combination of rewards and social support were significantly more effective than other strategies. The increased information on perinatal outcomes strengthened the findings of a reduction in preterm birth and low birthweight. One trial reported method of delivery and one reported breastfeeding: neither showed an effect of the intervention.