Marijuana flower/buds (you can use as much or as little as you want, but for reference, an eighth oz (3.5 g) of weed will produce about 30-60 mL of vape juice. (You can also use a high-grade cannabis concentrate, such as BHO wax, shatter, etc to produce a more potent e-liquid) Pure USP food grade vegetable glycerin.Aug 26, 2020