Experts argue it's never too late to quit smoking, and a new study says that applies to people with late-stage cancer as well.

Patients with advanced cancer gained nearly a full year of additional life if they quit smoking, compared to those who kept lighting up, researchers reported Thursday in the Journal of the National Comprehensive Cancer Network.

"It is never too late, and no one is ever 'too sick' to quit smoking," said senior researcher Dr. Li-Shiun Chen, director of the smoking cessation program in the Barnes-Jewish Hospital's Siteman Cancer Center at Washington University School of Medicine at St. Louis.

"Individuals with cancer who stop smoking after their diagnosis live significantly longer than those who continue smoking, even when their cancer is at an advanced stage," Chen continued in a news release.

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