The Risky Business of
Lighting Up by Mike Mills
IF you smoke, you are taking a deadly risk. According to the American Heart Association ( AHA), smoking is the "single most preventable risk factor" contributing to early death in the United State. This means quitting is the best thing you can do to avoid an early death. And early, preventable deaths from smoking related illnesses-about 442,000 a year- make up nearly one-fifth of all deaths.
Because smoking damages the cardiovascular system, it can quadruple the risk of getting coronary heart disease (CHD), the No.1 single caue of death in the United States. Smoking is a major cause of stroke, the No. 3 killer.
Cardiovascular Damage
The nicotine and carbon monoxide in cigarette smoke do most of the damage to the cardiovascular system. Nicotine, and addictive drug, acutely increases blood pressure and heart rate. It also narrows arteries and damages their lining.
Carbon monoxide binds to hemoglobin, which carries oxygen in the bloodstream. The binding effect reduces the amount of oxygen transported to your body's tissues.
Over time this combination of assaults on the cardiovascular system from nicotine, carbon monoxide, and other substances can speed up the process of atherosclerosis, or hardening of the arteries, resulting in chronic high blood pressure, narrowing of the arteries, restricting the flow of blood, and increasing its tendency to clot. All these factors lead to an increased risk of heart attack and stroke.
Artery damage that restricts blood flow to other parts of the body-kidneys, stomach, arms, legs, and feet-is called peripheral artery disease (PAD). PAD is 10 times more likely to develop in a smoker that in a nonsmoker.
Smoking can also promote heart disease by reducing HDL (good) cholesterol, which can lead to atherosclerosis. As soon as you quit smoking, your HDL cholestrol levels improve.
Secondhand Smoke
Breathing someone else's smoke can also cause disease, according to the American Heart Association. Secondhand smoke, a mixture of smoke given off by the cigarette and exhaled smoke, is a factor in about 35,000 deaths a year from cardiovascular disease. In fact, studies show that the risk of dying from heart disease brought on by secondhand smoke is about 10 times greather than the risk of dying from lung cancer.
Secondhand smoke contains more than 4,000 chemicals, of which at least 69 can cause cancer. Other chemicals found in cigarette smoke can do additional damage:
- Ammonia- Irritates and damages eyes, nose and airways. Unlikely to cause cancer.
- Benzene- Causes drowsiness, dizziness or headache. Causes leukemia and other cancers of the blood.
- Cadmium- Damages lungs. Causes shortness of breath, chest pain or cough. Causes cancer.
- Formaldehyde- Produces watery eyes; burning eyes, nose and throat; and skin rashes. Causes cancer.
- Lead- Causes learning disabilities, memory loss and decreased IQ. Likely to cause cancer.
- Polycyclic aromatic hydrocarbons- A group of 100 chemicals that can cause skin rashes, sensitivity to sunlight, eye irritation, and cataracts. Likely to cause cancer.
When Smokers Quit
After a person stops smoking, the body starts to recover almost immediately:
20 minutes: Blood pressure drops to a level clost to that before the last cigarette.
24 hours: The chance of a heart attack decreases.
2 weeks to 3 months: Circulation improves, and lung function increases up to 30 precent.
1 to 9 months: Coughing, sinus congestion, fatigue, and shortness of breath decrease.
1 year: The excess risk of coronary heart disease is half that of a smoker.
5 to 15 years: Stroke risk is reduced to that of a nonsmoker.
15 years: Risk of coronary heart disease is that of a nonsmoker.
November/December 2005 StrokeCONNECTION pages 28-29
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