Believe it or not, it's already been one year since Peter Jennings died of lung cancer. His impact on ABC was greater than anyone on the outside ever realized, judging by how the news division has been reeling lately. Since last August, a number of unforseen circumstances have caused an anchor merry-go-round that has stopped with Charles Gibson... for now.

To mark the anniversary of Jennings' death, World News will pay tribute to Jennings tonight by reporting on lung cancer prevention and programs that help people stop smoking. The coverage is part of the network's "Quit to Live" series, which was initiated two months after the anchor's passing.