Another factor you have to consider when buying a vape pen is whether it is single-use or multipurpose. Single-use vape pens can only be used with one type of cannabis material. For instance, it may only be used with dry herbs or concentrate. Multipurpose use vape pens, on the other hand, can be used for more than one type of material. This does not only give you the flexibility and convenience of using the pen, but it also comes with cost benefits. You will enjoy the benefit of two different vape pen types at the price of one.