1. Lengths of follow‐up available for included studies, grouped by intervention type.

Study ID	Short‐term outcomes (≤ 6 weeks after quit date)	Long‐term outcomes (≥ 6 months after quit date)	Notes
Acupressure
Li 2009	x		Also in continuous stimulation (acupressure) subgroup
Tian 1996	x	x
White 2007	x
Wing 2010	x		Short‐term follow up > 6 weeks (3 months from treatment) Also in continuous stimulation (acupressure) subgroup
Zhang 2013	x		Short‐term follow up > 6 weeks (8 weeks) Also in continuous stimulation (acupressure) subgroup
Acupuncture
Bier 2002	(x)	(x)	Data not consistent so not included in any meta‐analysis
Circo 1985	x
Clavel 1985	x	x
Clavel 1992	x	x
Cottraux 1983	x	x
Gilbey 1977	x		Also in continuous stimulation (indwelling needle) subgroup
Gillams 1984	x	x	Also in continuous stimulation (indwelling needle) subgroup
Han 2006	(x)		Compares acupuncture with acupuncture, not included in any meta‐analyses
He 1997	x	x	Also in continuous stimulation (acupressure) subgroup
Huang 2012	x		Also in continuous stimulation (acupressure) subgroup
Labadie 1983	x	x	Short‐term follow up >6 weeks (8 weeks)
Lacroix 1977	x
Lagrue 1980	x
Lamontagne 1980	x	x
Leung 1991	x	x
Martin 1981a; Martin 1981b	x	x	Also in continuous stimulation (indwelling needle) subgroup
Parker 1977a; Parker 1977b	x		Parker 1977a also in continuous stimulation (indwelling needle) subgroup
Steiner 1982	x
Vandevenne 1985	x	x
Vibes 1977	x		Also in continuous stimulation (indwelling needle) subgroup
Waite 1998	x	x	Also in continuous stimulation (acupressure) subgroup
White 1998	x	x
Wu 2007	x	x	Also in continuous stimulation (indwelling needle) subgroup
Electrostimulation
Antoniou 2005	x
Aycicegi‐Dinn 2011	x
Fritz 2013	x
Georgiou 1999	x
Pickworth 1997	x
Scheuer 2005	x	x
Yeh 2009	x		Also in continuous stimulation (acupressure) subgroup
Laser therapy
Cai 2000	x
Docherty 2003		x
Kerr 2008	x	x