What is the cause of lung cancer in coal miners?

Emphysema is a chronic disorder caused by which of the following?

Match the names of diseases listed under Column $I$ with their meanings given under Column $II$,and choose the answer that provides the correct combination.

Column $I$ (Name of disease)	Column $II$ (Meanings)
$(A)$ Jaundice	$(p)$ Allergic inflammation of nose
$(B)$ Stenosis	$(q)$ Loss of motor functions
$(C)$ Rhinitis	$(r)$ Heart valve defect
$(D)$ Paralysis	$(s)$ Increase in bile pigments in the blood
	$(t)$ Septal defect of heart

Which chronic disorder is characterized by damage to the alveolar walls,leading to a decrease in the respiratory surface area,and is primarily caused by cigarette smoking?

Smoking leads to which of the following changes in the blood?

Which of the following statements is correct regarding human respiration?