Focus on second-hand smoking
The world known ABC anchorman and senior editor Peter Jennings died of lung cancer at 67. We've also heard that Superman's widow Dana Reeve has lung cancer.
Over at PBS.org they have an online focus on lung cancer and the risk of lung cancer in non-smokers explained very easy to understand by Dr. Mark Clanton from the National Cancer Institute and Dr. Joan Schiller from University of Wisconsin.
If you want to calculate on your risk - this tool developed by American Cancer Society researchers are calculating the lung cancer risk of "heavy smokers". It is based on a study that tracked cancer development in people older than 50 and who smoked at least half a pack a day for at least 25 years. However, the fact that most people will not fit into the conditions, it does not have much value.