You’re educated, equipped, and ready to go, but now you’re wondering how to use cannabis oil. We have good news—it couldn’t be easier. To use a pre-filled THC oil-filled cartridge on a reusable pen, there’s usually a button you need to hold down as you inhale. You can generally just puff away if you’re using a disposable cartridge! Ready to start your vaping adventure? Here are some of our favorite vape brands: Strong THC Vape Cartridge