Green Smoke e-cigarettes utilize pre-filled cartridges, often referred to as cartridges or flavor pods, designed for single use. These cartridges are intended to provide a convenient and consistent vaping experience, and they do not support refilling. Attempting to refill them could lead to damage or poor performance, and it may pose safety risks as well. If you are looking for a more sustainable option, you may want to explore other vaping devices that allow for refillable tanks or pods. These alternatives often provide greater flexibility in terms of flavors and e-liquids. For specific guidelines or recommendations, it is advisable to check the information on the official Green Smoke website, which details product offerings and usage instructions.