Vape pens refer to portable pen-shaped vaporizers designed specifically for cannabis extracts and oils rather than dry herb material. They consist of a compact lithium-ion battery coupled with a small tank or cartridge containing cannabis oil, distillate or a similar liquid concentrate formulation. Screwing the oil-filled cartridge onto the universal 510-threaded battery activates the heating element located within the cartridge's atomizer component. Then the user simply inhales the resulting concentrated cannabis vapor through the mouthpiece at the tip by pressing a button as they draw. Easy to operate and ultra discreet to carry, all-in-one vape pens provide an accessible, familiar, and tidy format for reliably vaporizing measured doses of cannabis oils or distillates containing either precise ratios of THC, CBD, or a combination of both cannabinoids for on-the-go relief. However, tremendous variability exists in quality, safety, purity, and contents between different brands of cartridges, batteries, and formulas. So purchasing reputable, lab-tested vape pens from licensed retailers ensures regulatory oversight, quality control, and predictable results.