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Then I saw it with Adam Lambert here

Further reading in NEJM.

Code J44.1, COPD with acute exacerbation should be used when the documentation clearly states that the patient is experiencing a worsening of respiratory symptoms beyond normal day-to-day variation, requiring a change in therapy

While a normal pair of lungs supports efficient gaseous exchange, immune response and disease resistance, smokers lungs face impaired functionality, disease risk and irreversible damage caused by smoking

but also in terms of long-term impact on lung function decline." "Our findings advocate a need for further focus on preventing harmful exposure to the airways from exposure in cleaning activities," the study concludes.