Well, my vials of liquid nicotine — “E-juice” — came, and I experimented with refilling my Blu cigarette cartridges with it. And it in fact works.
FIRST, THIS IS VERY IMPORTANT: NICOTINE IS A POISON. DO NOT FUCK AROUND WITH IT, DO NOT SWALLOW IT, ETC. I TAKE NO RESPONSIBILITY FOR YOUR ACTIONS IF YOUR ARE DUMB AROUND LIQUID NICOTINE. TRY TO WEAR GLOVES, AS NICOTINE IS HIGHLY TRANSDERMAL.
Now, with that out of the way, you can, if you wish, attempt to refill your Blu cartridges by following the step-by-step directions in the middle of the following thread:
Happy vaping and good luck.