Yes, vape pens will almost certainly set off a walk-through metal detector because they are primarily constructed of metal components, including the battery casing, heating coils, and internal sensors. If you walk through a security gate with a vape in your pocket, the "pulse induction" technology will detect the metallic mass and trigger an alarm. To avoid delay and embarrassment at airport security, you should always place your vape pen and any spare batteries in the plastic bin for X-ray screening along with your keys and phone. It is a critical safety rule that all vaping devices and lithium-ion batteries must be kept in your carry-on luggage; they are strictly prohibited in checked bags because they pose a fire risk in the cargo hold. Furthermore, ensure any e-liquid tanks are nearly empty or stored in a leak-proof bag, as the change in cabin pressure during flight can cause them to leak, potentially damaging your electronics or the aircraft's interior.