Breath test may catch lung disease before standard tests do

This study tested a new way to find early signs of lung damage in people with COPD or ILD by analyzing carbon dioxide (CO2) in their breath in real time. The goal was to detect changes before standard lung function tests show any problems. Researchers compared breath patterns among 40 participants, including patients and healthy smokers and non-smokers. This was an observational study, not a treatment, so it helps improve understanding and future diagnosis.