Blood test could catch lung cancer early in heavy smokers

This study aims to develop a blood test that can find early-stage lung cancer in heavy smokers who have no symptoms. Researchers will collect blood samples from 350 current or former smokers, including those with and without lung cancer, and track their health for two years. The goal is to see if the test can reliably detect cancer early, when it's easier to treat. Participants will not receive their test results, as this is a research study to validate the method.