The purpose of this study is to test whether the three-seeds mixture tea reduces sputum and/or cough in COPD patients, and if so, to evaluate whether the three-seeds mixture changes the lung microbiome.

Inclusion Criteria:

1. Males or females ages 50-80 at the time of entry
2. Non-smoker for at least 1 year
3. Chronic bronchitis with Fev1 <80% and Fev1/ Fvc <0.7 and daily sputum production
4. Documentation of COPD. We define COPD as the presence of irreversible airflow obstruction, presence of emphysema on CT scan or both. This determination will be by the pulmonary physicians leading this study.
5. Ability and willingness to provide informed consent.

Exclusion Criteria:

1. Current Smoker 2. Asthma or other respiratory diseases 3. Frail patients (unintended weight loss, long term fatigue). 4. Patients with acute COPD exacerbation

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