Comparison 4. Sensitivity analysis by intensity, including Hajek 2002, with Lancaster, Bolman, Curry as low intensity.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Smoking cessation at longest follow‐up	43	21141	Risk Ratio (M‐H, Fixed, 95% CI)	1.25 [1.18, 1.33]
1.1 High‐intensity intervention	32	15085	Risk Ratio (M‐H, Fixed, 95% CI)	1.31 [1.22, 1.40]
1.2 Low‐intensity intervention	11	6056	Risk Ratio (M‐H, Fixed, 95% CI)	1.09 [0.96, 1.25]