Assessment of Exhaled Breath Condensate Hydrogen Peroxide (EBC H2O2) as Measured Using a New Device (Inflammacheck™) in Patients With Interstitial Lung Disease, Lung Cancer and Healthy Volunteers.

Inclusion Criteria: * Male or Female, aged ≥18 years. * A confirmed, clinician made diagnosis of Interstitial Lung Disease (ILD) supported by evidence of ILD on a CT chest scan recorded at any time. * OR a clinician suspected or confirmed Lung Cancer, with or without asthma and/or COPD * OR a healthy volunteer with no known history of lung disease (defined as no current clinical diagnosis of, or be receiving treatment for, a lung disease). * Willing and able to give informed consent for participation in the study. Exclusion Criteria: * Existing co-morbidities that may prevent them from performing spirometry or other study measurements (at the discretion of the clinical investigator). * Known other lung, chest wall, neuromuscular, or cardiac disease or abnormality (including end-stage disease or cancer) that would confound symptom scores and spirometry. * In the opinion of the clinical investigator, participant could be put at risk of harm by having to perform any of the study procedures. * Unable to comprehend the study and provide informed consent, e.g. insufficient command of English in the absence of someone to adequately interpret.