Buying a cannabis vaporization pen When shopping for a vaporization pen, there are many factors that one has to consider if they are to make the best decision. This review focuses on the double G series vape pen which is specially designed for users who have a bias to ground cannabis. There are a number of reasons why this product is superior to several others that are available in the market as you will see in a short while. It is as though there is a new brand of vaporizers every other day. ...