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The study took place primarily in Kansas and Missouri, with additional sites in Colorado, Texas and Michiganareas that have high smoking rates and high mortality from lung cancer

It's Never Too Late to Drink Less Alcohol or Quit Smoking Country music legend Willie Nelson, 90, is taking better care of his health by stopping alcohol consumption and quitting smoking something he suspects may have added some more time to his life

Retrieved 5 July 2018

Expressed equivalently, the rate ratio (RR) for the effect of a unit increase in exposure is constant across covariate levels and equal to the antilog of the exposure coefficient : RR = exp()