Percentage of overall weight and potency remaining after vaporizing???

So I wanted to try a little experiment.
1 - Take 1 oz of ganja (i have some querkle) and see what percentage of overall mass is lost after going through my buddha vaporizer.
2 - Figure out a good control and see what overall perentage of thc is lost through me vaporizing the 1 oz.

Also, if this has already been done, stop me cause youll be saving me 2 months of remembering to update this thead.

I'm curious cause I think the most valuable thing to do with the vape leftovers is to make some green dragon. I made some almost a month ago with some great stuff (unvaped) and everyone loves it. The effects varied by person. For me if I take 5ml I feel medicated for about 2-3 hrs. For another, she took 6ml and felt medicated for 9 hrs.
So obviously this tincture is great. I want to make it with already vaped meds to use up all the plant. Stems work too.

Anyways, any thoughts about this? Anyone tried to do it?

sounds like number two will be kinda hard to gauge accurately imo... how are you going to be able to judge how much thc was in the bud to begin with, let alone how much is going to be left over after you vape the bud?? maybe you could send it out to get it measured, but that would cost you a few bucks no doubt, and i haven't a clue as to where one would go about doing something like that, but maybe you or someone else would ...