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.

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

Many were stunned to learn that a foundation Cornell set up and listed in the New England Journal of Medicine in October 2006 as a sponsor of the study actually got $3.6 million from a parent company of cigarette maker Liggett Group Inc. The tobacco source was reported by The New York Times on Wednesday.

Liggett, whose owner was the first to break with other tobacco companies and say that tobacco is addictive and deadly, announced its donation to the Cornell foundation in 2000 in a news release. But the foundation's funding source wasn't disclosed to the journal. Liggett's headquarters used to be in Durham, N.C.

On Wednesday, company spokeswoman Carrie Bloom said in a statement that the company "had no control or influence over the research."

Scientists must maintain the trust of patients in research studies, and "any breach of that trust is not simply disappointing but, I believe, unacceptable," Dr. John Niederhuber, director of the National Cancer Institute, said in a statement.

Cornell's dean, Dr. Antonio Gotto, said, "The claim that we set this foundation up in order to cover up the money just isn't true. We made a public announcement that we were taking the money from the tobacco company."