These little glass cartridges, usually holding half a gram or a full gram of cannabis oil, are the lifeblood of a modern vape pen. You screw one onto a small battery, press a button, and inhale a smooth, often flavorful vapor instead of harsh smoke. They're incredibly discreet and easy to use, making them popular for both medical patients needing a precise dose and recreational users who want a cleaner, more controlled experience compared to rolling a joint or packing a bowl. cannabis vape cartridges 9
