Since this study was funded by the Federal Government, it is political by nature. Hard to know if it is true or not. The Federal Government usually specifies the results it wants as a precondition to getting the money.
...while the Institute of Medicine report is among the most comprehensive analyses of the link between smoking bans and drops in heart disease, the state of the science in this area appears to be swaying even the public pronouncements of tobacco companies. David Sutton, a spokesman for Philip Morris U.S.A., ... ... Mr. Sutton said the company supported smoking bans in public areas.