Several factors increase the risk of cancer (officially known as malignant neoplasm), including pollutants, tobacco use, certain infections, radiation, obesity, and lack of physical exercise.
An estimated 5 to 10% of cancers are entirely hereditary. Most cancers develop through a combination of hereditary and environmental factors.
Smoking causes an estimated 90% of lung cancer. Tobacco has killed 50 million people in the last decade. If trends continue, a billion people will die from tobacco use and exposure this century, which equates to one person every six seconds.
Those who sleep less than six hours a night are more likely to develop colon cancer than those who sleep more.
In 2008, there were an estimated 12,667,500 new cases of cancer worldwide. Eastern Asia had the most new cases (3,720,000) and Micronesia the fewest (700). North America had approximately 1,603,900 new cases.
One in eight deaths in the world are due to cancer. Cancer causes more deaths than AIDS, tuberculosis, and malaria combined.
Cancer is the leading cause of death in developed countries and the second leading cause of death in developing countries, after heart disease. Globally, heart disease is the number one killer.
In 2008, 7.6 million people died of cancer globally, which equates to 21,000 cancer deaths a day. By 2030, 21.4 million new cancer cases are expected to occur globally with 13.2 million cancer deaths.
Nitrites are chemical additives used to preserve and add flavoring to most lunch meats, including cold cuts and hot dogs. Once in the body, they react with body chemicals and turn into cancer-causing carcinogens. Americans eat more than 20 billion hot dogs per year.
The most common cancer in women globally is breast cancer, with an estimated 1.4 million new cases diagnosed in 2008. Breast cancer is also the leading cause of cancer death in women worldwide, with an estimated 458,400 deaths a year.