Dude, that is because 82.8% die from heart disease before they can get lung cancer.
^^^ He's right here. My stepfather smoked non-filtered Lucky Strikes for 41 years (since he was 12) and eventually needed a quintuple bypass. The surgery went fine but he died almost two weeks later from a blood clot that moved to his lungs and suffocated him - was in the hospital too at the time cause just prior he was coughing up fluid so they readmitted him.
Before the heart surgery they told him his lungs were like swiss cheese and he would need them operated on as well but the heart issue was critical so it would come first.
Rev.