Most cartridges may be refilled with your have THC oil, CBD vape oil or e-liquid before you decide to need to get rid of them. If it’s a 510 fashion cartridge, just unscrew the mouthpiece and fill the tank up. You might need to work with a syringe for precision. https://augustzbktu.blogzet.com/thc-cartridges-an-overview-47483639