A 65-Year-Old Man Has Smoked Tobacco Most of His Adult

A 65-year-old man has smoked tobacco most of his adult life.When planning health promotion education for him, the nurse includes information that such smoking:

A) may produce alterations in his immune response.
B) is a risk factor for community-acquired pneumonia.
C) decreases the production of an immunoglobulin called IgA.
D) increases his risk of gastric cancer.