All I can say on this is genetics, yes, smoking does pose health risks as all the things mentioned in the post. But a few years ago (10 now) I remember there was an old man on the local Richmond news, they were shooting a piece on him becasue he was celebration his 110th Birthday, and when the reporter asked him his secret to a long life he said "a pack of cigarettes a day and a good shot of JD". I laughed my ass off when that came out, because the reporter was expecting some BS about living healthy etc. etc. but he just blurted it out and he had smoked since the age of 13. No I do not believe that smoking contributed to his longevity, but it also did not stop him from living a very long time. So I say a lot of health issues are genetic, you are born and your alarm clock is set, when the bell (buzzer for the younguns) rings, time up, no matter how you lived.
So smoke if you enjoy it and if you fear that you will not make it to a 100 then dont.