E-cigarettes vs. cigarettes: Which one is more harmful?
As medical professionals, we are well aware of the dangers of tobacco to human health. In recent years, e-cigarettes, as...
phlegm
Coughing up phlegm repeatedly, what diseases could it be?
Sputum is the secretion of the bronchi and trachea, or the exudate in the alveoli, which is coughed up. Expectoration...
