| Study | Reason for exclusion |
|---|---|
| ACTRN12609000627257 | Non‐MI intervention components not matched between arms |
| ACTRN12609001039279 | Non‐MI intervention components not matched between arms |
| ACTRN12612000016831 | Was non‐randomised or quasi‐randomised |
| ACTRN12614000876695 | Non‐MI intervention components not matched between arms |
| ACTRN12614001147673 | Was non‐randomised or quasi‐randomised |
| ACTRN12616000314426 | Participants not current smokers |
| Aertsen Van Der Kuip 2006 | Measured cessation at less than 6 m follow‐up |
| Ahluwalia 1998 | Did not test a behavioural motivational smoking cessation intervention |
| Auer 2016 | Was non‐randomised or quasi‐randomised |
| Baker 2006 | Non‐MI intervention components not matched between arms |
| Bernstein 2018 | Measured cessation at less than 6 m follow‐up |
| Boccio 2017 | Was non‐randomised or quasi‐randomised |
| Bolger 2010 | Measured cessation at less than 6 m follow‐up |
| Bonevski 2018 | Non‐MI intervention components not matched between arms |
| Borrelli 2002 | Non‐MI intervention components not matched between arms |
| Borrelli 2005 | Non‐MI intervention components not matched between arms |
| Borrelli 2016 | Non‐MI intervention components not matched between arms |
| Borrelli 2017 | Non‐MI intervention components not matched between arms |
| Boyle 2007 | Tested a motivational intervention not based on M & R's MI |
| Breland 2014 | Measured cessation at less than 6 m follow‐up |
| Bronson 1989 | Tested a motivational intervention not based on M & R's MI |
| Brooks 2017 | Non‐MI intervention components not matched between arms |
| Brown 2003 | Non‐MI intervention components not matched between arms |
| Caponnetto 2017 | Intervention based on stages of change theory |
| Carpenter 2004 | Tested a motivational intervention not based on M & R's MI |
| Cigrang 2002 | Did not test a behavioural motivational smoking cessation intervention |
| Collicott 2001 | Measured cessation at less than 6 m follow‐up |
| Cornuz 2002 | Tested a motivational intervention not based on M & R's MI |
| Curry 2003 | Non‐MI intervention components not matched between arms |
| Dornelas 2000 | Intervention based on stages of change theory; only participants in precontemplative and contemplative stages received MI counselling, the rest received relapse prevention counselling only |
| Eakin 2014 | Did not test a behavioural motivational smoking cessation intervention |
| Emmons 2001 | Non‐MI intervention components not matched between arms |
| Ershoff 1999 | Participants were pregnant smokers |
| Gariti 2002 | Non‐MI intervention components not matched between arms |
| George 2000 | Non‐MI intervention components not matched between arms |
| Glasgow 2000 | Non‐MI intervention components not matched between arms |
| Ha 2012 | Was non‐randomised or quasi‐randomised |
| Ha 2015 | Was non‐randomised or quasi‐randomised |
| Haas 2015 | Non‐MI intervention components not matched between arms |
| Hennrikus 2002 | Did not test a behavioural motivational smoking cessation intervention |
| Hennrikus 2005 | Non‐MI intervention components not matched between arms |
| Hokanson 2006 | Non‐MI intervention components not matched between arms |
| Horn 2007 | Non‐MI intervention components not matched between arms |
| Huang 2015 | Non‐MI intervention components not matched between arms |
| Hughes 2017 | Participants not current smokers |
| Hutchinson 2017 | Participants not current smokers |
| Hyman 2007 | Did not test a behavioural motivational smoking cessation intervention |
| Idrisov 2013 | Non‐MI intervention components not matched between arms |
| Ingersoll 2005 | Measured cessation at less than 6 m follow‐up |
| IRCT2017080435257N1 | Tested a motivational intervention not based on M & R's MI |
| ISRCTN11353250 | Non‐MI intervention components not matched between arms |
| ISRCTN50627997 | Tested a motivational intervention not based on M & R's MI |
| Klemperer 2017 | Tested a motivational intervention not based on M & R's MI |
| Krigel 2011 | Measured cessation at less than 6 m follow‐up |
| Lasser 2012 | Did not test a behavioural motivational smoking cessation intervention |
| Lennox 1998 | Intervention based on stages of change theory |
| Lindqvist 2013 | Was non‐randomised or quasi‐randomised |
| Luna 2005 | Measured cessation at less than 6 m follow‐up |
| Ma 2005a | Was non‐randomised or quasi‐randomised |
| Ma 2005b | Was non‐randomised or quasi‐randomised |
| Mahajan 2017 | Was non‐randomised or quasi‐randomised |
| Manfredi 1999 | Measured cessation at less than 6 m follow‐up |
| Manfredi 2004 | Did not test a behavioural motivational smoking cessation intervention |
| Martin‐Lujan 2011 | Non‐MI intervention components not matched between arms |
| Mazas 2007 | Didn't measure smoking cessation |
| McCambridge 2005 | Participants not current smokers |
| Menzie 2018 | Measured cessation at less than 6 m follow‐up |
| Metse 2017 | Non‐MI intervention components not matched between arms |
| Metz 2006a | Non‐MI intervention components not matched between arms. NRT only recommended to participants in one trial arm |
| Metz 2006b | Tested a motivational intervention not based on M & R's MI |
| Meyer 2003 | Tested a motivational intervention not based on M & R's MI |
| Mujcic 2018 | Non‐MI intervention components not matched between arms |
| NCT00169260 | Tested a motivational intervention not based on M & R's MI |
| NCT00701896 | Tested a motivational intervention not based on M & R's MI |
| NCT00907309 | Did not test a behavioural motivational smoking cessation intervention |
| NCT01098955 | Tested a motivational intervention not based on M & R's MI |
| NCT01846910 | Non‐MI intervention components not matched between arms |
| NCT01982617 | Measured cessation at less than 6 m follow‐up |
| NCT02086162 | Tested a motivational intervention not based on M & R's MI |
| Nichter 2018 | Tested a motivational intervention not based on M & R's MI |
| Pardavila‐Belio 2015 | Non‐MI intervention components not matched between arms |
| Parker 2007 | Participants were pregnant smokers |
| Persson 2006 | Non‐MI intervention components not matched between arms |
| Pineiro 2014 | Was non‐randomised or quasi‐randomised |
| Polosa 2011 | Intervention based on stages of change theory |
| Reitzel 2010 | Participants were pregnant smokers |
| Rigotti 1997 | Non‐MI intervention components not matched between arms |
| Rigotti 2006 | Participants were pregnant smokers |
| Rogers 2016 | Was non‐randomised or quasi‐randomised |
| Schuck 2014 | Non‐MI intervention components not matched between arms |
| Severson 2009 | Non‐MI intervention components not matched between arms |
| Sherbot 2005 | Intervention based on stages of change theory |
| Sims 2013 | Tested a motivational intervention not based on M & R's MI |
| Skov‐Ettrup 2016 | Intervention based on stages of change theory |
| Smith 2001 | Did not test a behavioural motivational smoking cessation intervention |
| Sobell 2017 | Non‐MI intervention components not matched between arms |
| Steinberg 2016 | Measured cessation at less than 6 m follow‐up |
| Stotts 2002 | Participants were pregnant smokers |
| Stotts 2009 | Participants were pregnant smokers |
| Tappin 2000 | Participants were pregnant smokers |
| Tappin 2005 | Participants were pregnant smokers |
| Thomsen 2010 | Non‐MI intervention components not matched between arms |
| Van Rossem 2015 | Tested a motivational intervention not based on M & R's MI |
| Wakefield 2004 | Non‐MI intervention components not matched between arms |
| Weaver 2015 | Measured cessation at less than 6 m follow‐up |
m: month M & R: Miller & Rollnick MI: Motivational Interviewing NRT: Nicotine replacement therapy