http://news.bbc.co.uk/2/hi/health/7325971.stm
Quote: Three research teams, writing in the journals Nature and Nature Genetics, each pinpointed two key areas of variation on chromosome 15.
The variants are common in the population - but they only raise lung cancer risk in those who have smoked.
Current or former smokers who carry two copies of both variants, one from each parent - about 15% of the total - have a raised risk of 70-80%.
Those who carry one copy of each variant have a raised risk of around 28%.
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I can see the upcoming lawsuit now: My parents are responsible for my cigarette addiction and/or cancer issues.
This might be a true issue. But I see it being exploited much more then it being useful knowledge.