Unfortunately I went a little crazy purchasing V4L vapor king cartridges. I just had to try whatever flavour sounded yummy. I now realize I'm having trouble with PG - wicked sore throat and cankers in my mouth. I know that for some people these are just a result of quitting smoking however, I've been vaping Johnson Creek ejuices (low PG), in my njoy ncig, and haven't had a problem. I've switched back and forth and these problems only arise when I use the PG cartridges. My question is does anyone know of any empty cartridges that would fit the Vapor King? I don't mind taking a loss on the cartridges but not being able to use the e-cig, it just makes me crazy to think I wasted that much money. Any help would be greatly appreciated.