Exactly how long does a THC pen last? These factors include the dosage (milligrams per dose), the number of doses per container, the dimensions of the container, so the level of vapor created by each hit. Just how much CBD is in a CBD vape? Generally, CBD vapes can keep up to three mg of CBD per dose, with an ordinary tank holding between hundred and 300 milligrams. The amount of CBD in each vape pen depends on several issues. It...