This research study is being done because patients with a history of chest radiation treatment for Hodgkin's disease have been shown to be at increased risk for developing lung cancer a number of years out from treatment. The risk appears to be further increased among patients with a smoking history. Currently, the practice is to recommend annual low-dose chest CT scans in survivors of Hodgkin's disease who have received prior chest radiation treatment and who have at least a moderate smoking history. In this study, the CT scans will be read and interpreted by the study radiologist, and the results recorded in a consistent manner.

- Participants will undergo a chest computed tomography (CT) scan once a year for a 3-year period.

Inclusion Criteria:

• 5 years or longer from initial Hodgkin's disease diagnosis
• Current age 18 or older
• Received mediastinal irradiation and/or alkylating-agent based chemotherapy
• Smoking history of 10-pack years or more, or current smoker
• Pre-approval from the participant's insurance company for the CT study

Exclusion Criteria:

• Patients with a history of lung cancer
• Currently receiving treatment for another cancer diagnosis
• Known diagnosis of any metastatic cancer
• Pregnant women