Correlation between smoking and lung cancer in US males, showing a 20-year time lag between increased smoking rates and increased incidence of lung cancer. (Photo credit: Wikipedia)

Bill is angry with himself that he ever accepted that first cigarette. "When I was 15, I started smoking. It was a stupid thing I wish I could take back."Bill has diabetes. He learned the hard way that smoking makes diabetes harder to control. At 37, Bill went blind in his left eye from a detached retina—damage to the inner lining of the eye. He also had kidney failure. Two years later, he had his leg amputated due to poor circulation—made worse from smoking. "I lost my leg, and that's when I quit,"he says.

http://www.cdc.gov