Which of the following is a long-term effect of tobacco use?

• A. Asthma
• B. Emphysema
• C. Pneumonia
• D. Bronchitis

Answer: (B)

Prolonged exposure to tobacco smoke causes lasting damage to the lungs, with emphysema representing a key long-term change. In emphysema, the walls between air sacs (alveoli) break down and lose their elasticity, shrinking the surface area available for gas exchange. This permanent destruction makes it hard to breathe and is a classic, lasting consequence of smoking.

Asthma isn’t a direct result of tobacco use; it’s a separate chronic condition of airway hyperreactivity that smoking can worsen but does not typically arise as a long-term change from smoking itself. Pneumonia is an infection, not a permanent lung change caused by smoking. Bronchitis can be a long-term inflammation of the airways, especially in smokers, but the defining long-term structural consequence most closely linked to tobacco use is emphysema.