When I watch on television or on Youtube people who have horrible illnesses, cancers and that they are going to die, I can't help but think that I wouldn't like to make a "swap". I would give everything to be able to have their tumor, to make an exchange but it is unfortunately impossible.
Also, the end of life would be much more pleasant! When people know that you are going to die prematurely from disease, they take advantage of you, of your last moments together. They'll be nice because they'll know it's over soon.
When it's suicide, they don't care, they don't believe you. They're not trying to take advantage of your last moments, maybe it's denial. When it's a physical illness, things are more concrete.