The disclosure of hidden tobacco money behind a big study suggesting that lung scans might help save smokers from cancer has shocked the research community and raised fresh concern about industry influence in important science.

Two medical journals that published studies by Weill Cornell Medical College researchers in 2006 are looking into tobacco cash and other financial ties that weren't revealed. The studies reported benefits from lung scans, which the Cornell team has long touted.

It's a crucial public health issue: Dozens of groups, including such anti-smoking crusaders as the American Cancer Society, have given the Cornell team money to see if routinely screening smokers with CT scans can spot the world's most lethal cancer in time to prevent deaths.