The U.S. would have several million fewer smokers if graphic warning labels, similar to those introduced in Canada nearly a decade ago, were required on cigarette packs, according to researchers at the University of Illinois at Chicago and the University of Waterloo. The Canadian labels led to a 2.9 to 4.7 percentage point drop in smoking rates – which would mean 5.3 to 8.6 million fewer smokers in the U.S. if the same result were obtained. The findings are published online in the journal Tobacco Control.