Newly Detected Air Pollutant Mimics Damaging Effects Of Cigarette Smoke

Of course, some lung cancer will occur in non-smokers simply from random mutations, like from naturally occuring gamma rays and such.

http://www.sciencedaily.com/releases/2008/08/080817223432.htm

ScienceDaily (Aug. 18, 2008) — A previously unrecognized group of air pollutants could have effects remarkably similar to harmful substances found in tobacco smoke, Louisiana scientists are reporting in a study scheduled for presentation today at the 236th National Meeting of the American Chemical Society. Inhaling those pollutants exposes the average person up to 300 times more free radicals daily than from smoking one cigarette, they added.

The discovery could help explain the long-standing medical mystery of why non-smokers develop tobacco-related diseases like lung cancer, said H. Barry Dellinger, Ph.D., the Patrick F. Taylor Chair of Environmental Chemistry at Louisiana State University in Baton Rouge.

"Free radicals from tobacco smoke have long been suspected of having extremely harmful effects on the body," Dellinger said. "Based on our work, we now know that free radicals similar to those in cigarettes are also found in airborne fine particles and potentially can cause many of the same life-threatening conditions. This is a staggering, but not unbelievable result, when one considers all of diseases in the world that cannot currently be attributed to a specific origin."