Yes, in 2026, UK Civil Aviation Authority (CAA) regulations strictly mandate that all vapes and e-cigarettes must be carried in hand luggage or on your person. They are strictly prohibited from checked (hold) luggage due to the fire risk posed by their lithium-ion batteries. You must ensure the device is completely powered off to prevent accidental activation during the flight. For e-liquids, standard security rules apply: containers must be 100ml or less and placed inside a single, transparent, resealable 1-litre plastic bag. While some UK airports are phasing out the 100ml rule with new 3D scanners, many still enforce it, so it is safer to stick to the limit. It is also a "pro-tip" to empty your vape tank before boarding, as cabin pressure changes frequently cause tanks to leak, potentially damaging your electronics or creating a mess. Vaping on the aircraft remains a serious criminal offense, and charging your device during the flight is also prohibited by most UK airlines.