Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

1,490 questions · 1,526 findings · 124 reviews

No studies found 263 · 17.2%GRADE not reported 224 · 14.7%Very low 292 · 19.1%Low 327 · 21.4%Moderate 286 · 18.7%High 134 · 8.8%

Longer vs shorter duration of combination nicotine replacement therapy

Smoking cessation ‐ 16 weeks versus 8 weeks · people who smoke

It is very uncertain whether longer changes smoking cessation ‐ 16 weeks versus 8 weeks compared with shorter duration of combination nicotine replacement therapy (very low certainty).

1 finding from 1 review

Longer vs shorter duration of combination nicotine replacement therapy

SAEs · people who smoke

It is very uncertain whether longer changes overall SAEs ‐ 26 weeks versus 8 weeks compared with shorter duration of combination nicotine replacement therapy (very low certainty).

3 findings from 1 review