How should the nurse record smoking history on a patient who has smoked 2.5 packs of cigarettes per day for 10 years? a. Patient has smoked cigarettes for 10 years. b. Patient smokes 2.5 packs of...

How should the nurse record smoking history on a patient who has smoked 2.5 packs of cigarettes per day for 10 years?

a. Patient has smoked cigarettes for 10 years.

b. Patient smokes 2.5 packs of cigarettes per day.

c. Patient has a 12.5 pack-year smoking history.

d. Patient has a 25 pack-year smoking history