Very early stage lung cancer of about 4 mm can be detected by CT scan of the chest. It is well known that stage I peripheral lung cancer has an expected survival rate of 92% at 10 years after surgery. By 10-year survival rate, we mean that ninety-two percent of people are still alive 10 years after surgery. This is the benefit of early detection of lung cancer. Therefore, experts in various countries recommend regular low-dose CT screening for people at high risk for lung cancer. High-risk groups include people aged 55 to 74 years with a smoking history of ≥30 pack years and <15 years of cessation or people aged ≥50 years with a smoking history of ≥20 pack years. If you belong to the high-risk group, it is recommended that you have an annual physical examination and add low-dose CT screening of the chest to detect lung cancer early and extend your life expectancy by at least 10 years, so why not?