Design: Prespecified subgroup analysis of a multicentre randomised cessation trial
Population: 172 smokers with COPD analysed (immediate referral vs usual care)
Primary outcome: Verified smoking cessation at one year
Effect: 25.8% vs 10.1% quit; usual-care odds ratio for cessation 0.25 (0.09–0.64)

Smoking cessation is the single intervention that most changes the course of COPD, yet many patients keep smoking after diagnosis. This prespecified subgroup analysis of a multicentre cessation trial followed 172 smokers with COPD randomised to immediate referral to a cessation clinic or to usual care.

At one year, 18.6% had quit overall, but the route mattered: 25.8% quit with immediate referral versus 10.1% with usual care (usual care odds ratio for cessation 0.25). Absence of other comorbidity and more than one exacerbation-related hospitalisation were also associated with quitting, the latter on only 10 patients and so imprecise. Baseline lung function and nicotine-dependence score did not independently predict quitting.

The practical message is to build an active referral into COPD care rather than advising cessation and leaving it there. A fifth of patients were lost to follow-up, so the absolute rates are soft, but the direction — structured pathways beat ad-hoc advice — is the usable point, and it is cheap to act on anywhere.

Immediate referral to a cessation clinic more than doubled one-year quitting versus usual care (25.8% vs 10.1%).
Build an active cessation referral into routine COPD care, not just verbal advice.
Lung function and nicotine-dependence score did not independently predict who quit.
Absolute quit rates are uncertain given a fifth were lost to follow-up.

Why it matters

It shows the most effective COPD intervention depends on how cessation is delivered, not just whether it is advised.

The statistics, in plain English

A quit rate of 25.8% versus 10.1% is a large relative difference, but on 172 patients with a fifth lost to follow-up the exact figures are imprecise; the reliable signal is that referral beats usual care.