A37-year-old female patient who smokes 20 cigarettes a day is prescribed oral contraceptives. Which nursing action is the priority based on the patient's history and medication?

A. Encourage the patient to take oral contraceptives at the same time every day to improve effectiveness: Taking oral contraceptives at the same time each day improves contraceptive effectiveness and maintains stable hormone levels. However, consistent timing does not address the significant cardiovascular and thromboembolic risk associated with heavy cigarette smoking. Safety considerations take priority over effectiveness teaching in this scenario. B. Advise the patient to quit smoking before starting oral contraceptives due to increased risk of blood clots, myocardial infarction, and stroke: Smoking 20 cigarettes per day significantly increases the risk of venous thromboembolism, myocardial infarction, and stroke when combined with estrogen-containing oral contraceptives. Counseling on smoking cessation is a priority to reduce life-threatening complications. C. Instruct the patient to monitor for signs of nausea and mood changes as common side effects of oral contraceptives: Nausea and mood changes are common side effects of oral contraceptives but are generally mild and non–life-threatening. Monitoring for these effects does not address the patient’s elevated risk for serious cardiovascular events. Priority nursing actions focus on preventing severe adverse outcomes. D. Recommend the patient increase fat intake to reduce the risk of blood clots while taking oral contraceptives: Increasing dietary fat does not reduce the risk of thromboembolism and may worsen cardiovascular risk factors. There is no evidence supporting fat intake as a protective measure against blood clots. This recommendation contradicts evidence-based cardiovascular health guidance.