HUMAN NUTRITION

Detailed explanation-1: -The more years a person smokes and the more cigarettes smoked each day, the more risk goes up. 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.

Detailed explanation-2: -About 50% to 60% of lung cancers found in people who never smoked are adenocarcinomas (cancer that begins in the cells that line the lung’s tiny air sacs and make substances such as mucus). About 10% to 20% are squamous cell carcinomas (cancer that forms in the thin, flat cells lining the inside of the lungs).

Detailed explanation-3: -It is also important to avoid secondhand smoke. Quitting smoking lowers the risk for 12 types of cancer: cancers of the lung, larynx, oral cavity and pharynx, esophagus, pancreas, bladder, stomach, colon and rectum, liver, cervix, kidney, and acute myeloid leukemia (AML).

Detailed explanation-4: -The two general types of lung cancer include: Small cell lung cancer. Small cell lung cancer occurs almost exclusively in heavy smokers and is less common than non-small cell lung cancer. Non-small cell lung cancer.

Detailed explanation-5: -Not all people who get lung cancer smoke. As many as 20% of people who die from lung cancer in the United States every year have never smoked or used any other form of tobacco. But, lung cancer in people who have never smoked is one of the most fatal cancers in the United States.