Women seem less likely to either develop or die from lung cancer if they engage in physical activity, and the benefits increase the more a woman stays on the move, Stanford University researchers found.

"We saw that as levels of physical activity increase, risk of lung cancer decreased," said lead author Ange Wang, a medical student at Stanford.

Even active smokers enjoyed some protective benefit from lung cancer, when compared with couch potatoes who smoked, the researchers said.

Meanwhile, a French study found that women may reduce by as much as one-third their risk of developing breast cancer by engaging in vigorous physical exercise. But that benefit did not extend to those who had ever taken hormone replacement therapy.

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