Screening guidelines are heavily tested on all the USMLE exams (especially 2CK/3). In this extremely HY podcast, I discuss all you need to know from a screening perspective for NBME exams. I categorize things in a way that makes remembrance extremely easy. You will get many questions right from this podcast on your exam.
EDIT: For lung cancer, it’s a 20 pack year history (not 30 pack years). And screening starts at 50 years, not 55. Apologies for the confusion. For colon cancer as of 2023, screening starts at 45 with colonoscopies every 10 years. It no longer starts at 50.
divineinterventionpodcasts.com 
The USPSTF recommends annual screening for lung cancer with low-dose computed tomography (LDCT) in adults aged 50 to 80 years who have a 20 pack-year smoking history and currently smoke or have quit within the past 15 years.
(The podcast says ages 55-80 for this type of screening).
https://www.uspreventiveservicestaskforce.org/uspstf/recommendation-topics/uspstf-and-b-recommendations
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