ReviewThe Lancet. Respiratory medicine2022
Chronic obstructive pulmonary disease in never-smokers: risk factors, pathogenesis, and implications for prevention and treatment.
Review in The Lancet. Respiratory medicine, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 260 papers, 5 of them syntheses that pooled it.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
260 citing papers in PubMed, 5 syntheses or guidelines pooled it, 469 citations in OpenAlex.
- Pooled it
- The Burden of Chronic Obstructive Pulmonary Disease in the US: A Systematic Review of Nationally Representative Health Surveys.International journal of chronic obstructive pulmonary disease · 2026Pooled it
- Meat Consumption Associated with the Risk of Chronic Obstructive Pulmonary Disease: A Systematic Review and Meta-Analysis.Nutrients · 2025Pooled it
- Association between air pollution and risk of non-alcoholic fatty liver disease: an updated meta-analysis.Frontiers in public health · 2025Pooled it
- A 7-point evidence-based care discharge protocol for patients hospitalized for exacerbation of COPD: consensus strategy and expert recommendation.NPJ primary care respiratory medicine · 2024Pooled it
- Effect of Eccentric Cycling on Oxygen Uptake and Hemodynamics in Patients with Chronic Obstructive Pulmonary Disease: A Randomized Controlled Crossover Trial.Respiration; international review of thoracic diseases · 2025Trial
- ZDHHC5-mediated S-palmitoylation of NOD2 drives neutrophil extracellular trap formation via mitophagy to exacerbate inflammation in COPD.Biomarker research · 2026Article
- ERS Congress 2025: highlights from the Paediatrics Assembly.ERJ open research · 2026Review
- Dysregulated ITGA3/FAK/YAP axis mediates impaired alveolar type II epithelial cells function in COPD.Journal of advanced research · 2026Article
- Article
- Diagnostic and Monitoring Potential of Sputum-Derived miRNAs in Patients with Chronic Obstructive Pulmonary Disease.International journal of molecular sciences · 2026Review
- Association between serum perfluoroalkyl substances and COPD risk: population evidence and in vitro validation.BMC pulmonary medicine · 2026Article
- Comprehensive Assessment of Direct and Passive Smoking Across the Pancreatitis Spectrum.Pancreas · 2026Article
- Effect of Socioeconomic Status on Lung Function in the Korean General Population.Journal of Korean medical science · 2026Article
- Patient journeys mapping in health management for older patients with chronic obstructive pulmonary disease: a qualitative descriptive study.BMC public health · 2026Article
- Blood eosinophil count and clinical characteristics according to etiology in chronic obstructive pulmonary disease.BMC pulmonary medicine · 2026Article
- [Management of patients with chronic obstructive pulmonary disease in routine clinical practice].Innere Medizin (Heidelberg, Germany) · 2026Review
- AHNAK promotes oxidative stress and inflammatory responses in chronic obstructive pulmonary disease by activating the Notch pathway.Journal of thoracic disease · 2026Article
- UBE2M-mediated neddylation modification stabilizes VEGFR2 to delay pulmonary vascular endothelial cell senescence.Cell death & disease · 2026Article
- A Brief History of COPD: As Told by Some of Its Senior Scientists and Clinicians.Journal of clinical medicine · 2026Review
200 more citing papers are in PubMed but not listed here.
Corrections and comments
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Authors and funding
3 authors at 3 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Chronic obstructive pulmonary disease (COPD) was traditionally thought to be caused by tobacco smoking. However, recognition of the importance of non-smoking-related risk factors for COPD has increased over the past decade, with evidence on the burden, risk factors, and clinical presentations of COPD in never-smokers. About half of all COPD cases worldwide are due to non-tobacco-related risk factors, which vary by geographical region. These factors include air pollution, occupational exposures, poorly controlled asthma, environmental tobacco smoke, infectious diseases, and low socioeconomic status. Impaired lung growth during childhood, caused by a range of early-life exposures, is associated with an increased risk of COPD. Potential mechanisms for the pathogenesis of COPD in never-smokers include inflammation, oxidative stress, airway remodelling, and accelerated lung ageing. Compared with smokers who develop COPD, never-smokers with COPD have relatively mild chronic respiratory symptoms, little or no emphysema, milder airflow limitation, and fewer comorbidities; however, exacerbations can still be frequent. Further research-including epidemiological, translational, clinical, and implementation studies-is needed to address gaps in understanding and to advance potential solutions to reduce the burden of COPD in never-smokers.
Indexed as
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What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.