In the U.S. there are many studies on the association between tobacco use and cancer have been conducted, these studies estimate that about one-third of people die from cancer related to tobacco use. Tobacco causes approximately 90% of people die from lung cancer and cigarette smoking causes cancers in many other parts like the throat, larynx, esophagus, pancreas, uterus, cervix, kidney , bladder, colon and rectum.
Lung cancer
Nearly 50 years ago, Doll and Hill have shown that smoking causes lung cancer and mortality due to lung cancer increased with the number of cigarettes. Worldwide incidence of lung cancer increased rapidly in the past 60 years, increasing more than other types of cancer and this ratio showed the closely related with the number of smokers increased. Low lung cancer rates in the residential population is not common smoking.
Smoking is a major cause of lung cancer, approximately 87% of the 177,000 new cases in 1996 in the U.S. are infected by tobacco, the rest are due to other causes such as environmental pollution, occupational diseases, food , the location and genetic factors. 90% of the 660,000 cases of lung cancer are diagnosed annually in the world are smokers. Assuming the risk of those who do not smoke get lung cancer is a risk of lung cancer of smokers is 10 times higher than nonsmokers. Increased level of risk varies by type of cancer, risk of carcinoma cell carcinoma scales and small cells in smokers increased while 5 to 20 times the risk of cancer glands and epithelial carcinoma cells increased 2 to 5 times greater than non-smokers.
The level of risk will increase with the number of years smoking, number of daily cigarette consumption and age at starting smoking as soon as danger. How much smoking increases the risk of drug is lung cancer? It is found that any amount of tobacco that also cause increased risk of lung cancer. In other words there is no lower limit of the amount of tobacco needed to cause lung cancer. Smoking time is also important, as long-time attraction, the greater damage.
Those who do not smoke but married to smokers, the mortality rate from lung cancer 20% higher than the married to nonsmokers and mortality from lung cancer also increased with the number of drug is drawn by the wife or husband.
Only about 13% of patients with lung cancer survive 5 years. The rate of death due to lung cancer in male smokers 22 times higher compared to men not smoking, and women are roughly 12 times. While many women believe breast cancer is the main cause, the cause of death in women in 1988 to lung cancer is higher than in breast cancer deaths in women.
Passive smoking increases the risk of lung cancer with relative risk index ranges from 1.2 to 1.5. While simultaneously smoking and exposure to other toxic factors, the risk of causing lung cancer will increase many times.
The type of cancer in parts of the head and neck
Cancers of the head and neck parts including esophageal cancer, larynx, tongue, salivary glands, lips, mouth and throat. The risk of this cancer increases with the number and duration of smoking. Tobacco and alcohol are the two most powerful factors to cause cancer in parts of the head and neck. Alcohol and other manufactured products made from tobacco together increases the risk of causing cancer in the long run.
Cancer of the esophagus: The risk of developing esophageal cancer by smoking 8 to 10 times greater than non-smokers. These risks will be increased from 25 to 50 percent if smokers use more alcohol.
Laryngeal cancer: Smoking causes 80% of laryngeal cancer. Smokers bear the risk of laryngeal cancer more than 12 times higher than nonsmokers.
Oral cancer: Smoking is a major cause of cancer of the tongue, salivary glands, mouth and throat. Men who smoke are 27 times larger than the risk of developing the disease, oral cancer than men who do not smoke.
Nasal cancer: long-term smokers will have twice the risk than non-smokers develop cancer of the nose.
Kidney and bladder cancer
Smokers at risk for both kidney cancer and bladder. Of the total deaths due to bladder cancer, the estimated 40 to 70% is due to tobacco use.
Pancreatic cancer
Pancreatic cancer is easier online because of smoke into the body through the blood to the pancreas and gallbladder. It is estimated that tobacco is the cause of 30% of total cancer pancreas.
Genital cancer
Vulvar cancer: Cancer of the vulva, is part of the female genitals generally rare. However, that woman is smoking doubled the risk of vulvar cancer.
Uterine cancer: The link between smoking and cervical cancer was discovered only recently. At least 12 studies have found women who smoke have increased risk of cervical cancer and the risk increases with the number and duration of drug use.
Penis Cancer: Cancer of the penis has become increasingly common in men who smoke than male non-smokers.
Anal cancer and colorectal
Anal Cancer: Evidence recently discovered the role smoking causes anal cancer and colorectal. Also in a large study conducted in the U.S., for male and female smokers at risk of cancer increased from 75 to 100%? Compared to the same age who do not smoke.
