Vape pens are an increasingly popular and convenient way to consume cannabis. They can be pre-charged and disposable or you can buy a low-cost rechargeable battery that uses interchangeable cannabis oil cartridges. There are also a few systems out there, like the popular Pax Era, that use a proprietary cartridges. Vape pens and cartridges can be sold by cannabis strain, plant type and/or potency. However some products are sold based solely on effect. THC and CBD amounts are usually listed in percentages or ratios on these products. A Harborside Cannabis Consultant can help you pick the vape pen and oils that are right for you.