To Begin with , Most THC cartridges contain a gram (1 mL) or half gram (0.5 mL) of THC oil, usually extracted from cannabis plants or hash. They are generally good for around 200-400 puffs. In Effect , Sometimes potent THC distillate cartridges are mistakenly referred to as wax carts or dab carts. Although some companies do make re-fillable 510 tanks for wax and dabs, they are not as convenient. The most popular ways to vape dabs or wax is using an e-nail or a dab pen.