A research team has completed a study indicating that increased tobacco-control activity could save more lives than previously estimated. Lead study author Bruce Leistikow, a UC Davis associate adjunct professor of public health sciences, said, "The full impacts of tobacco smoke, including secondhand smoke, have been overlooked in the rush to examine such potential cancer factors as diet and environmental contaminants. As it turns out, much of the answer was probably smoking all along." The analysis, published online in BMC Cancer, linked smoking to more than 70 percent of cancer deaths among Massachusetts men in 2003.