You shouldn't. I just lost a coworker a week ago last Thursday. He went in for tests in late August because he wasn't keeping food down & his gut hurt when he stood. Initial tests were Stage 4, esophageal/lung/liver. Later tests in found it pervasive in his body - bone & lymph nodes included. One day, he's joking with me about something at work, the next day gone.
He was a heavy smoker.