Study	Reason for exclusion
Ahijevych 2000	No control group
Bastien 1983	Controlled trial, but not randomized
Carmody 2017	Relapse prevention trial so participants had already quit smoking
Casmar 2003	Short follow‐up (3 months)
Cornwell 1981	Short follow‐up (2 months)
Crasilneck 1968	No control group
Dedenroth 1968	No control group
Frank 1986	All groups received hypnotherapy; trial was to test combining with other support and varying schedules
Green 2006	This is a meta‐analysis.
Hasan 2007	Not a randomized trial (patients were allow to self‐select their group)
Javel 1980	Not randomized (consecutive allocation), short follow‐up
Johnson 1994	No control group
Katz 1978	No control group
MacHovec 1978	Not stated to be randomized
Owens 1981	No control group
Peckham 2015	This pilot RCT did not make any specific reference to hypnotherapy interventions.
Perry 1975	No control group
Perry 1979	No non hypnotherapy control group, short follow‐up (3 months)
Pierson 2016	This is a meta‐analysis and did not include any hypnotherapy interventions.
Richard 2002	Descriptive report, not a controlled trial
Riegel 2013	Not randomized; participants chose group or individual hypnosis
Rodriguez 2007	Short follow‐up (3 months)
Schubert 1983	Short follow‐up (4 months)
Sood 2006	Not RCT, cross‐sectional survey
Spanos 1993	Short follow‐up
Spanos 1995	Short follow‐up (3 months)
Spiegel 1993	No control group
Tahiri 2012	This is a meta‐analysis
Thomas 2015	This was a structured questionnaire survey of participants enrolled in an RCT.
Tindle 2006	The control group received the same intervention 12 weeks after randomization.
Valbo 1995	Short follow‐up (4 months)