i have had serious discussions with my dh and family (sibs, mother) regarding this because at around age 40 i suffered 2 strokes that dramaticly changed my life.
i am adamantly against removing feeding/hydration tubes if they are the only means of "life support" a patient is utilizing. my belief is based on the fact that any human being who is withheld food or water will die after some period of time, therefore it is not "life support" it is being humane.
as far as being on a breathing machine or other mechanical means to sustain life-if i were physicaly or mentaly impaired such that it is not a reasonable expection for me to regain/maintain my own major bodily functions (breathing, heart beat...) without the aide of these machines-i opt for "life support" to be discontinued (i'm not referring to a pace maker or such-but rather major medical equipment that would relegate my body to a sustained vegatative physical state).
this is not a financial consideration-it is an emotional consideration. i would not want my children/family to emotionaly burdened with what i consider to be a prolonged death. i would rather that they move forward with their lives.
my fil (who was in his 80's at the time) who was in extreemly poor health suffered a fall a few years ago that resulted in a snowball effect that landed him in icu on life support. although the prognosis was grim even should he recover my mil insisted he remain on life support. he was in icu for 4 months-over 2 1/2 on life support, the remainder weaning off the respirator and enduring grueling physical rehabilitation. he returned home and passed less than a month later. my mil still supports her decision saying "if i had'nt fought for him we never would have had that last month together". that last month (during which fil was immobile, could not communicate, require constant around the clock care) cost a tremendous physical and emotional toll on my fil whose body and spirit were exhausted by the tremendous strain and toil it had been through, and his children and grandchildren (who will always remember grandpa not as the vibrant man he was, but as the "man on the machine" who was angry and confused when they visited him in rehab/at home).
for me "life" is far more than a biological process that can be sustained via artificial means.