I have noticed that most Cigarettes packet has a warning label that smoking cigarettes causes lung cancer and other lung problems, but I knew some people who lived to their 90s and still smoke cigarettes and they are well alive and kicking. On the other hand, there was a young guy who passed away in his thirties and he was a smoker but not a heavy chain smoker. Does it matter if family genes play a role in whether a person gets lung cancer from smoking or not?