[Heretic]

as a practitioner of the use of chi, I can say with confidence that you can never run out of it

in fact it really isn't yours to lose in the first place

you are simply a conduit of already existing energy

I suppose you can burn the body out in a way that would limit your capacity to hold it though

but death? I have never heard of such a thing in my travels

now if you are talking about dark magic in which you "trade" your life force with a menevolent being for something in return (power, riches, fame) then I suppose that is plausible, but that is not the natural order of things and a totally different scenario than just using your own capacity to channel such energies

IMHO magic is practice of using charms, spells, or rituals

it is the intent that defines it as white or dark magic

my two cents