Oil and Concentrate Vaporizers allow the user to enjoy their favorite oils, concentrates, bho or e-juice/e-liquid. All of these units are very portable and compact, making it excellent choice for maximum stealth and discreetness. Most of these oil vaporizers utilize a lithium ion battery and a cartridge/tank system that can be replaced or changed at any time. These units are user-friendly and typically have a one button activation system that makes them very simple to operate. Vaporizer pens or “pen vapes,” as they are popularly called, have gained in popularity due to their efficiency, ease of use and lack of discernible aroma in the vapor they produce.