Smoking increases the chances of developing advanced kidney cancer, the most deadly form of the disease, researchers have found out.

According to the study from Duke University Medical Center which studied smoking histories of 845 people who had surgery for kidney cancer between 2000 and 2009, results showed that advanced kidney cancer was diagnosed in about 20 percent of the 435 people who’d never smoked.

However, a 9 percent reduction in the risk for advanced kidney cancer is lessened every decade that a smoker quits.

“If you stop smoking, the risk stops,” Dr. Matvey Tsivian, a urologic oncology fellow and the study’s lead author, said in a Duke news release. “And the longer you stop smoking, the better it is.”

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