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IT'S NO SECRET THAT cigarettes are bad for your health. It's common for those who smoke to say they want to quit and maybe even make efforts to stop, but then they end up lighting up again. Quitting smoking improves health and reduces the risk of an early death. "Smoking is the number-one cause of preventable death in the U.S.," says Thomas Ylioja, clinical director of health initiatives programs and a tobacco cessation expert at National Jewish Health in Denver.