@spedteacher At the request of @hopeful33250 I am responding to you. I had melanoma on my right forearm, which resulted in a surgery leaving a 32 stitch scar.
From medline.com, here is an article about CEA and when it may be useful https://www.healthline.com/health/cea
It does mention about smoking being a factor to raise a CEA level. Does that fit in you case?
As far as questions to ask your dr, I might ask if the test should be done again. That would be a simple first step. The anxiety and concern you have should also be conveyed, especially if you have been a patient of this dr for a while.
Will you come back and let me know how your appt goes, and how you are doing?