ACochrane review included 17 trials. Trained professionals were more likely to counsel patients about smoking, and to initiate other interventions such as setting a quit date, suggesting a follow-up appointment, and offering self-help materials. No evidence of an effect for continuous smoking abstinence following the intervention was found in 13 trials. Meta-analysis of 14 studies for point prevalence of smoking produced a statistically and clinically significant effect in favour of the intervention (OR 1.36, 95% CI 1.20 to 1.55). Meta-analysis of 8 studies that reported continuous abstinence was also statistically significant (OR 1.60, 95% CI 1.26 to 2.03).
Comment: The quality of evidence is downgraded by imprecise results (few outcome events).