Some Vampire Questions (True Blood type Vamps)

Things I’d like to know about Vampires

Thanks to the HBO show, True Blood, it’s now a well known fact that Vampire blood heals… does that mean that vampires could actually CURE people? (example: someone has terminal cancer, but gets put on a regimen of vampire blood to cure the cancer?)
If that were the case, would you accept this treatment? or would your political, religous… etc, views keep you from receiving vampire blood treatments for your illness/disease
Also: we’ve seen that it’s used as a recreational druge, dropped like acid by junkies, BUT if you’re hurt, I’ll heal you without the psychotropic side effect. Does it only have that effect on people not infirmed? Is this a brain chemistry kind of thing?

Vampires drink human blood (or True Blood, it’s synthetic counterpart) to sustain themselves… then what? They’re dead so how is it absorbed into the body? Is it digested? Is there ever any ‘waste’ left over that needs to be excreted?