A George Washington University researcher estimates that GOP presidential candidate John McCain has about a 20 percent chance of dying in office if elected, based on his age and past use of tobacco, UPI reported Sept. 3.
John Banzhaf, a well-known tobacco researcher and industry critic, said that McCain, 72, has a 10-year death risk of between 35 and 50 percent, and also a high risk of disability.
The candidate's smoking history raises his risk of dying from lung cancer by about 700 percent, said Banzhaf.

The researcher estimated that McCain's health risks means that Republican vice-presidential candidate Sarah Palin has up to a 40 percent chance of becoming the president of the United States due to McCain's death or disability from a stroke, dementia, or other causes.
Banzhaf estimated the 10-year death risk for Democratic candidate Barack Obama, 47 -- who also has a history of smoking -- at under 10 percent.
McCain has survived four cases of melanoma, a potentially deadly form of skin cancer.
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WASHINGTON, Sept. 3 (UPI) -- John McCain's smoking history and age indicate Sarah Palin would have as high as a 40 percent chance of becoming U.S. president, a university professor says.
McCain, 72, a former smoker poised to become the Republican presidential nominee, has about a 20 percent of dying in office and a higher rate of disability, John Banzhaf, George Washington University professor, said Wednesday in a release.
Palin, 44, McCain's running mate, is governor in Alaska.
McCain's smoking history boosts his risk of dying from lung cancer by about 700 percent, and his risk of dying of chronic obstructive pulmonary disease also is greater, Banzhaf said. His age increases his odds of becoming disabled from conditions such as a stroke or Alzheimer's disease, which can impair judgment.
McCain has a 10-year death rate of between 35 percent and 50 percent, the professor said.
Potential health risks facing Democratic nominee Barack Obama, 47, are different, Banzhaf said. Men who are age 45 and are former smokers have less than a 5 percent chance of dying within the next 10 years, Banzhaf said. Even with an occasional lapse, Banzhaf said, Obama's 10-year death risk still is under 10 percent.
Obama's running mate, Sen. Joe Biden, D-Del., is 66.
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