Efficacy of Risk Reduction Tobacco

There is a large body of evidence from prospective cohort and case-control studies showing that many of the health risks of tobacco use can be reduced by smoking cessation. As compared with smokers, the excess risk of lung cancer decreases sharply in ex-smokers after approximately 5 years since quitting. Although an excess risk from smoking most likely persists through life, the excess risk approaches that of a never smoker after 15 to 20 years since quitting.4 After quitting, the risk of oral, pharyngeal, and laryngeal cancers decreases, approaching that of a never smoker in approximately 15 years.5,6 Also, within 2 years of quitting, the risk of pancreatic cancer decreases by approximately 50%.7-9

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