You are able to count on one pen to last you a month or so, but this will depend on how frequently you vape CBD. You need to realize that nearly all disposable CBD pens do not contain cartridges that are refillable. Typically, each pen is made up of around fifty milligrams of CBD, which in turn makes for about 200 inhalations. Just how long does a CBD vape pen last? In case you have a...