To estimate the prevalence of chronic obstructive pulmonary disease (COPD) and related risk factors in persons in opioid agonist treatment (OAT), to compare airflow limitation severity and age‐specific COPD prevalence rates with those in the general population, and to assess the OAT patients' willingness to adopt lifestyle changes and to use therapeutic offers for COPD management.. To read the full article, log in using your NHS Athens details. To access full-text: click “Log in/Register” (top right hand side). Click ‘Institutional Login’ then select 'OpenAthens Federation', then ‘NHS England’. Enter your Athens details to view the article.