The carcinogen benzo(a)pyrene binds to cells in the airways and major organs of smokers.
Smoking affects the function of the immune system and may increase the risk for respiratory and other infections.
There are several likely ways that cigarette smoke does its damage. One is oxidative stress that mutates DNA, promotes atherosclerosis, and leads to chronic lung injury. Oxidative stress is thought to be the general mechanism behind the aging process, contributing to the development of cancer, cardiovascular disease, and COPD.
The body produces antioxidants to help repair damaged cells. Smokers have lower levels of antioxidants in their blood than do nonsmokers.
Smoking is associated with higher levels of chronic inflammation, another damaging process that may result in oxidative stress.
Effects of Smoking 2 :
Every year hundreds of thousands of people around the world die from diseases caused by smoking cigarettes - Smoking KILLS.
One in two lifetime smokers will die from their habit. Half of these deaths will occur in middle age.
Tobacco smoke also contributes to a number of cancers.
The mixture of nicotine and carbon monoxide in each cigarette you smoke temporarily increases your heart rate and blood pressure, straining your heart and blood vessels.
This can cause heart attacks and stroke. It slows your blood flow, cutting off oxygen to your feet and hands. Some smokers end up having their limbs
amputated.
Tar coats your lungs like soot in a chimney and causes cancer. A 20-a-day smoker breathes in up to a full cup (210 g) of tar in a year.
Changing to low-tar cigarettes does not help because smokers usually take deeper puffs and hold the smoke in for longer, dragging the tar deeper into their lungs.
Carbon monoxide robs your muscles, brain and body tissue of oxygen, making your whole body and especially your heart work harder. Over time, your airways swell up and let less air into your lungs.
Smoking causes disease and is a slow way to die. The strain of smoking effects on the body often causes years of suffering.
Emphysema for example is an illness that slowly rots your lungs. People with emphysema often get bronchitis again and again, and suffer lung and heart failure.
Lung cancer from smoking is caused by the tar in tobacco smoke.
Men who smoke are ten times more likely to die from lung cancer than non-smokers.
Heart disease and strokes are also more common among smokers than non-smokers.
Smoking causes fat deposits to narrow and block blood vessels which leads to heart attack.
Smoking causes around one in five deaths from heart disease.
In younger people, three out of four deaths from heart disease are due to smoking
Cigarette smoking during pregnancy increases the risk of low birth weight, prematurity, spontaneous abortion, and perinatal mortality in humans, which has been referred to as the fetal tobacco syndrome.
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