I didn't watch my mom die. I was at home when she passed, but, she pretty well picked her date,calling us all on the Thursday prior. He sister was by her side.
I have, at one point, many years ago, when I was an EMT, watched a cardiac arrest.
That last final chest heave, in search of breath, I'll not forget, as we wheeled this guy into the OR. Later, the patient was distending from CPR, the doctor didn't wanna' quit, but, after banging on him for quite a while, it was obvious the guy was gone. It was the next door neighbor back in Nebraska. He was overweight, had smoked, and arrested. He didn't get enough oxygen soon enough, and passed.
Nowadays, CPR technique is completely different (a change started in Arizona). Compressions, compressions, compressions...breathe after you get the blood moved around.
My close aunt battled with lung cancer, and I was in the oncology ward. That is a HORRIBLE place,....
When I worked for IBM, I worked on the Samaritan Health Care system and saw almost all parts of the medical process. Radiation, in oncology is another particularly gruesome thing. You get MICROWAVED. Big machines that microwave your cancer with RF.....
Tobacco isn't worth all that pain and suffering.