Widespread implementation of CT-based lung cancer screening is underway, but its impact on cancer morbidity and mortality can only be achieved IF people are screened at appropriate intervals and abnormal findings are appropriately assessed. The degree to which individuals, especially those from medically underserved populations with highest lung cancer risks, will adhere to the complex, multi-step process of CT-based lung cancer screening has emerged as a key question with immediate need for solution. Specific aims of the study are as follows: