Why do some smokers get cancer while others do not? Part of the reason might be that they have a copy or two of a particular genetic marker on chromosome 15. Smokers with a single marker have a 30% higher cancer risk than those without it. Those with two have a 70% or 80% higher risk. It is not yet clear whether the mutation incites cancer cells, or whether it just makes people want to smoke more.
ScienceNow Daily News, 2 April 2008.
First Common Genetic Clue to Lung Cancer.(Nature, 3 April)