IIRC He was a heavy smoker that after several attempts finally was able to quit.
I smoked on a off for years...not, when I was pregnant and had small kids...on when I went back to work (at that time, everyone in the office smoked at their desks...stone ages)..
But I quit for good, about 12 years ago....I sure hope I quit soon enough..this is kinda scary, about Peter getting such a deadly case of cancer after having quit of a while, and only starting up for a couple of years...