OTTAWA, Canada (CNN) --Graphic warning labels on cigarette packages in Canada have been effective in discouraging smoking, according to a study by the Canadian Cancer Society. Fifty-eight percent ...

Individual warning labels will now appear on some cigarettes ... The new requirements begin with king-size cigarettes, which the Canadian Cancer Society says is the most common size sold.

King-size cigarettes ... Canadian Cancer Society, said health messaging would be conveyed in every puff and during every smoke break. Canada, he added, would have the best tobacco health warning ...

A lit cigarette burns on a package of cigarettes revealing the mandatory warning labels, in the 1960s. Credit - Bettmann Archive/Getty Images Vocal opponents of the tobacco industry, such as Sens.