Hello SRK, confident! We have a whole guide for CBD vape pens, many of which are refillable. There are some thicker oils out there, but most from the CBD vape oils are a 70/thirty blend, indicating they have an analogous viscosity to regular nicotine e-liquid. Best of luck! We http://www.fittingsflange.com/a-buyers-guide-to-cbd-topicals-creams-balms-roll-ons-and-cooling-gels/