Such a sad day. The guy announced around four months ago he was diagnosed with lung cancer and just the other day he made a post on his website thanking visitors for their well wishes. CNN has a good write up about his life.
Peter Jennings He admitted being a smoker until about 20 years ago, and said he "was weak and I smoked over 9/11." Condolenece to the family of this veteran news anchor.
Well, he must have been smoking quite a bit, or it was genetic somewhat. I guess it's hard to say. Just don't start and you should be fine (provided second hand smoke doesn't get ya).