Individual counselling leads to higher smoking cessation at longest compared with minimal contact control (high certainty).
Interventions directed at individuals: full financial coverage probably leads to higher abstinence from smoking compared with no financial coverage (moderate certainty).
Print‐based self‐help probably leads to higher abstinence ‐ individually tailored self‐help compared with no materials (moderate certainty).
Group‐format behavioural programmes showed no clear difference in group programme compared to face‐to‐face individual intervention compared with alternative support (moderate certainty).
Behavioural interventions showed no clear difference in individual counselling (in‐person) vs control Smoking cessation compared with minimal control (low certainty).
The intervention probably leads to higher individual counselling (moderate certainty).
It is very uncertain whether smoking cessation counselling changes quit at longest compared with no smoking cessation counselling, grouped by intensity of intervention (very low certainty).
More intensive leads to higher smoking cessation at longest compared with less intensive counselling (high certainty).