In chronic obstructive pulmonary disease (COPD), what is the primary benefit of quitting smoking?

In chronic obstructive pulmonary disease (COPD), the primary benefit of quitting smoking is the improvement in lung function. Smoking is one of the leading causes of COPD, as it damages lung tissues and leads to inflammation, narrowing of the airways, and increased mucus production. When a patient with COPD ceases smoking, they allow their lungs to start healing and reduce further damage. Over time, this can result in enhanced airflow, reduced symptoms such as coughing and wheezing, and a slower progression of the disease. While other benefits, such as reduced weight gain and improved energy levels, may also occur after quitting, the most significant and direct impact on a person's health with respect to COPD is the improvement in lung function. This makes it crucial for COPD patients to quit smoking to manage their condition effectively.