My father ended up with throat cancer 20-25 years ago. He said that the first question the docs always asked him is if he chewed or smoked a pipe. (He didn't do either, but he did smoke, Pall Malls.) He quit, and got radiation treatments, and lived until 2000.
One reason that I told my daughter and my son, if I EVER catch them smoking, I'd put 'em through a wall.