Cancer is generally not contagious. Cancer patients are not the source of infection, and lung cancer is the same, so it is not contagious. However, it is not excluded that patients may be accompanied by tuberculosis and other diseases during lung cancer. If these conditions exist, it will be contagious.

Suggestion:

Simple lung cancer is not contagious, and eating together has no effect. Infection must meet three conditions: source of infection, route of transmission and susceptible population, all of which are indispensable. Cancer patients themselves are not the source of infection, so they are not contagious.