Cigarette smoking's primary link to chronic respiratory disease

Steps:

• Identify diseases commonly tied to smoking: focus on lung and airway conditions from irritants in tobacco smoke.
• Recall that smoking causes inflammation and mucus buildup in the bronchi, leading to specific illnesses.
• Eliminate nutritional deficiency diseases, as smoking doesn't directly cause them.
• Match the strongest association: chronic bronchitis is a hallmark of smoker's disease.

Why B is correct:

• Bronchitis involves bronchial tube inflammation, directly caused by cigarette smoke's toxins irritating airways, per medical definitions of chronic obstructive pulmonary disease (COPD).

Why the others are wrong:

• A. Anemia results from blood disorders or nutrient deficiencies like iron, unrelated to smoking.
• C. Rickets stems from vitamin D deficiency affecting bone growth in children.
• D. Scurvy arises from vitamin C deficiency, causing connective tissue breakdown.

Final answer: B