I do seem to recall talk of Bill smoking when he was younger....
All jokes aside, why is it whenever someone gets cancer, we all finger through their lives for something THEY did to cause it?
We still don't know what causes cancer.
Lots of people that contract cancer don't and have never smoke(d) and lots of people that smoke (75% of heavy smokers BTW) NEVER contract cancer. Genetics probably plays a greater role than any of our life choices on when/if we will develop cancer of some form.
And no, I don't smoke and never have - nasty habit.