Right now I'm using a combination. That's because I got my vapes from e Smokey Treats, and I LOVED the flavor of the cartridges that came with them. Phil said he's switching over so the eSmokey Juice will be from the same manufacturer. Once I can get that flavor, I'll probably go with blanks.
I tried e-Liquid Planet and don't recommend them. Their coffee flavor is not bad, but it doesn't taste like coffee. The chocolate and watermelon, which are the other two I tried, have no flavor at all.
Today I got vanilla cartridges and vanilla eSmokeyTreats juice from Phil. They're good. I also got the strawberry. They're nicely sweet, but I can't say I taste any strawberry. Anyone found any fruit flavors that taste like fruit? Anyone have other suggestions on juice suppliers? Johnson Creek is expensive. Is it worth it?
I personally don't understand how anyone can vape without juice. No wonder their atomizers dry up.
As for the filament, go to a fabric store and get some of the stuffing fiber used to make home-made stuffed animals. Shred little bits of it off. That's what the wicks feel like to me -- polyfill stuffing fibers. With the small amount you'll need for a cartridge, one bag would last several heavy vapers their entire lives. I imagine there's nothing toxic in the stuffing since it's used to make things for little kids.
Just vapin' away and lovin' it!
Deb