The State reports: Study links cigarette changes to rising lung risk

It may be riskier on the lungs to smoke cigarettes today than it was a few decades ago - at least in the U.S., says new research that blames changes in cigarette design for fueling a certain type of lung cancer.

Up to half of the nation's lung cancer cases may be due to those changes, Dr. David Burns of the University of California, San Diego, told a recent meeting of tobacco researchers.

It's not the first time that scientists have concluded the 1960s movement for lower-tar cigarettes brought some unexpected consequences. But this study, while preliminary, is among the most in-depth looks. And intriguingly it found the increase in a kind of lung tumor called adenocarcinoma was higher in the U.S. than in Australia even though both countries switched to so-called milder cigarettes at the same time.

"The most likely explanation for it is a change in the cigarette," Burns said in an interview - and he cited a difference: Cigarettes sold in Australia contain lower levels of nitrosamines, a known carcinogen, than those sold in the U.S.

That's circumstantial evidence that requires more research, he acknowledged.

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