In heavy smokers,the alveoli of the lungs are enlarged and damaged,which reduces the surface area for the exchange of respiratory gases. This condition is called:

Give scientific reason: $(1)$ Smoking is a cause of hypertension.

Which of the following is a chronic respiratory disorder?

$A$ patient's blood analysis shows an abnormally high level of carboxyhemoglobin. Which of the following conclusions is most likely correct? The patient must have inhaled polluted air containing an abnormally high concentration of:

Name the chronic respiratory disorder caused mainly by cigarette smoking in which alveolar walls are damaged.

What is the minimum concentration and partial pressure of $CO$ in the alveoli that is dangerous to humans?