Smoking increases your risk for developing blood clots and heart disease, which can result in a heart attack, heart failure or stroke. Smoking causes your blood vessels to thicken. Fat and plaque then stick to the wall of your blood vessels, which makes it harder for blood to flow. Reduced blood flow to your heart may result in chest pain, high blood pressure, and an increased heart rate. Smoking is linked to lung disease and cancer, and can cause premature death. It is important for your health that you get information to help you quit smoking before you leave the hospital.