And who paid for that study? Phillip Morris? Bullshit, to put it mildly.
This is one, though not the study I read.
Genes Smoking and Lung Cancer Learn Science at Scitable
And this is from that report: "Years of study and a mountain of evidence point to tobacco smoking as the single most important risk factor for lung cancer. Nonsmokers (people who have smoked fewer than 100 cigarettes over the course of their lives) have less than a 1% chance of ever developing lung cancer. Smokers, on the other hand, have about a 14% chance of developing lung cancer at some point during their lifetime—that means their risk is more than ten times higher than that of nonsmokers! But is smoking the only factor that increases a person's risk of lung cancer? The short answer is no, as genetics has been shown to play a role as well." So, smoking is the single most important rick factor for developing lung cancer. And, this is actually the gist of the article: "Smoking is still the number-one cause of lung cancer in humans. Even if a smoker were to test negative for the 15q24 susceptibility locus, smoking could still seriously damage his or her health. Remember, even smokers without the locus have a tenfold greater risk of develop lung cancer than nonsmokers do. In other words, all smokers are at risk of lung cancer, but some smokers are a greater risk than others."