June 15, 2010 -- Having higher blood levels of vitamin B6 and the amino acid methionine both appear to reduce lung cancer risk in smokers and nonsmokers alike, according to a new study.

"We found that vitamin B6 and methionine are strongly associated with reducing lung cancer risk in people who never smoked, those who quit, and current smokers," researcher Paul Brennan, PhD, of the International Agency for Research on Cancer in Lyon, France, tells WebMD.

Whether the link is cause and effect, he says, is not known.

In the U.S. alone, more than 219,000 new cases of lung cancer were expected in 2009, according to the American Cancer Society, with about 160,000 deaths.

The study, funded by the World Cancer Research Fund and others, is published in The Journal of the American Medical Association.