The intervention leads to higher smoking cessation at longest (high certainty).
The intervention probably leads to higher smoking cessation at longest (moderate certainty).
The intervention probably leads to higher smoking cessation at longest (moderate certainty).
The intervention showed no clear difference in smoking cessation at longest (moderate certainty).
Individual counselling leads to higher smoking cessation at longest compared with minimal contact control (high certainty).
More intensive leads to higher smoking cessation at longest compared with less intensive counselling (high certainty).
Incentives probably leads to higher smoking cessation in pregnancy at longest compared with no incentives (moderate certainty).
Incentives leads to higher smoking cessation in mixed populations ‐ Longest compared with no incentives (high certainty).
It is very uncertain whether real‐time video counselling changes smoking cessation (strictest definition and longest compared with telephone counselling (very low certainty).
Biomedical risk assessment showed no clear difference in feedback on smoking exposure Smoking cessation at longest compared with standard care or minimal intervention (moderate certainty).