A 48-Year-Old Man Comes to the Office for an Initial

A 48-year-old man comes to the office for an initial visit.  He says that he feels well and has no medical problems.  The patient has a 20-pack-year smoking history and does not use alcohol or illicit drugs.  He is counseled on smoking cessation.  To explain how smoking affects lung function, the patient is shown a graph of the expected change in forced expiratory volume in 1 second (FEV1) over time if he continues to smoke at the same rate (curve D in image) .  Which of the following curves most likely demonstrates the expected FEV1 over time if this patient were to stop smoking now?

A) A
B) B
C) C
D) D
E) E

Correct Answer:

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