Listen DWK, tell him to visit a Veteran Administration hospital (or whatever is the equivalent in the UK- a hospital for retired soldiers)and talk to those guys about "quality" of life.
Cancer does effect some, but it really is not what causes the greatest suffering.
The real key here is that you can go on for 20-30 years being functional because the body is so forgiving, but when the symptoms appear, the damage is irreversible and the downward spiral is rapidly progressive.
As an analogy, you can walk on flat ground for a while until you reach the cliff, you don't even know it is coming. When you get there, the dropoff is very steep, and you go from "fine" to "debilitated", (can't walk to the toilet without getting short of breath(emphysema), can't go to the mailbox without your legs aching(vascular disease) and that pain in your chest may just be a signal of a massive heart attack (vascular disease, again) very quickly.
As I said before, in the young, even with all that pulmonary reserve, your exercise tolerance goes to hell.
Best of luck to your friend.
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