Delfi-Lung Cancer Screening Study Sponsor and Protocol Number: Delfi Diagnostics (Delfi-L101) Specialty: Oncology Type: Biospecimen Inclusion:Age 50+Current or former smoker (must have quit 15 years ago or less)Have had a negative lung cancer screening or a position lung cancer diagnosis or a high risk cancer diagnosis Exclusion:Prior systemic therapy, definitive therapy, radiation, or surgical resection for cancer within one year prior to enrollmentHistory of hematologic malignanciesHome oxygen useHistory of organ transplantHistory of blood products within 120 days