Smoking Causes 80 Percent Of Lung Cancer
Cigarette smoking is the number one risk factor for lung cancer. In the United States, cigarette smoking is linked to about 80 percent to 90 percent of lung cancers. Using other tobacco products such as cigars or pipes also increases the risk for lung cancer. Tobacco smoke is a toxic mix of more than 7,000 chemicals. Many are poisons. At least 70 are known to cause cancer in people or animals.
People who smoke cigarettes are 15 to 30 times more likely to get lung cancer or die from lung cancer than people who do not smoke. Even smoking a few cigarettes a day or smoking occasionally increases the risk of lung cancer. The more years a person smokes and the more cigarettes smoked each day, the more risk goes up.
Doctors believe smoking causes lung cancer by damaging the cells that line the lungs. When you inhale cigarette smoke, which is full of cancer-causing substances (carcinogens), changes in the lung tissue begin almost immediately. Chemicals in cigarette smoke enter our blood stream and can then affect the entire body. This is why smoking causes so many diseases, including at least 14 types of cancer, heart disease and various lung diseases.
At first your body may be able to repair this damage. But with each repeated exposure, normal cells that line your lungs are increasingly damaged. Over time, the damage causes cells to act abnormally and eventually cancer may develop.
People who quit smoking have a lower risk of lung cancer than if they had continued to smoke, but their risk is higher than the risk for people who never smoked. Quitting smoking at any age can lower the risk of lung cancer.
Smoking causes more than 4 in 5 cases of lung cancer. Lung cancer survival is one of the lowest of all cancers, and is the most common cause of cancer death. Cigarette smoking can cause cancer almost anywhere in the body. Cigarette smoking causes cancer of the mouth and throat, esophagus, stomach, colon, rectum, liver, pancreas, voice box (larynx), trachea, bronchus, kidney and renal pelvis, urinary bladder, and cervix, and causes acute myeloid leukemia.
Smoke from other people’s cigarettes, pipes, or cigars (secondhand smoke) also causes lung cancer. When a person breathes in secondhand smoke, it is like he or she is smoking. In the United States, two out of five adults who don’t smoke and half of children are exposed to secondhand smoke, and about 7,300 people who never smoked die from lung cancer due to secondhand smoke every year.
Smokers have a much higher risk of lung cancer than non-smokers, whatever type of cigarette they smoke. There’s no such thing as a safe way to use tobacco.
Filters and low-tar cigarettes make little difference – your lung cancer risk is not lower compared to smokers of average cigarettes. This may be because smokers tend to change the way they smoke in order to satisfy their nicotine craving, for example by taking bigger puffs or smoking more cigarettes.
The more cigarettes you smoke a day, the higher your risk of cancer. If you aren’t able to quit completely, cutting down the number of cigarettes you smoke a day can be a good first step. Even light or social smoking can harm your health so keep trying to stop entirely.
Scientists have found that the number of years you spend smoking affects your cancer risk even more strongly than the number of cigarettes you smoke a day. For example, smoking one pack a day for 40 years is even more dangerous than smoking two packs a day for 20 years.
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