Discuss how cigarette smoking contributes to the development of CVD
Smoking prompts the release of nicotine and another 1,200 toxic compounds into the bloodstream. Similar to hypertension, many of these substances are destructive to the inner membrane that protects the walls of the arteries. Once the lining is damaged, cholesterol and triglycerides can be deposited readily in the arterial wall. As the plaque builds up, it obstructs blood flow through the arteries.
Smoking also encourages the formation of blood clots, which can completely block an artery already narrowed by atherosclerosis. In addition, carbon monoxide, a byproduct of cigarette smoke, decreases the blood's oxygen-carrying capacity. A combination of obstructed arteries, less oxygen, and nicotine in the heart muscle heightens the risk for a serious heart problem.
Smoking also increases heart rate, raises blood pressure, and irritates the heart, which can trigger fatal cardiac arrhythmias. Another harmful effect is a decrease in HDL cholesterol, the "good" type that helps control blood lipids. Smoking actually presents a much greater risk of death from heart disease than from lung disease.
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