how do you know when the final day are near and you are dying from lung cancer

Each patient is different and no one knows how a person will be affected.

When my mom's days were numbered, she just knew when her time was up. She couldn't explain it. I, being her caregiver and daughter, noticed that she was eating less and less and wanting to sleep more and more. She also got weaker and weaker, to the point where she needed someone to almost carry her to the washroom. I noticed that the color of her skin changed to a more pale color and her eyes lost their color. It's hard to explain, but the day before she passed away, she just looked like she was going to die at any moment. Her last piece of advice that will always haunt me, but may make you feel better is "If this is dying, it's easy".