Which of these conditions is associated with smoking?

• A. Esophageal varices.
• B. Tonsillitis.
• C. Emphysema.
• D. Blindness.

Answer: (C)

Smoking damages the lungs in a way that leads to emphysema, a form of COPD where the walls between air sacs are destroyed. This destruction reduces the surface area available for gas exchange and makes the lungs less elastic, so air gets trapped and breathing becomes increasingly difficult, especially with chronic exposure to tobacco smoke. The damage happens because immune cells in the lungs release enzymes that break down elastic tissue, and the oxidative stress from smoke overwhelms the lungs’ defenses. That classic lung damage from long-term smoking is why emphysema is the condition most strongly associated with smoking.

Esophageal varices arise from high pressure in the portal vein usually due to liver disease, not smoking. Tonsillitis is an infection of the tonsils. Blindness can stem from several eye diseases; while smoking can increase risk for some eye conditions, the straightforward link in common medical knowledge is emphysema with smoking.