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