Taking an e-cigarette on a plane
The regulations around vaping gear in airports and on planes is an ever changing beast. The rules vary from airline to airline, and from airport to airport. The below points represent the most common vaping restrictions you’ll come across.

E-liquid
10ml bottles of vape juice, or e-cigarette refills, are fine in your hand luggage – just treat them as you would any other liquid and put them in the clear plastic bag when going through security. Larger shortfill e-liquids should go into your checked baggage.

Vape mods & batteries
Vape mods and batteries must be carried in your hand luggage – NOT in the hold. They must be charged and, preferably, disconnected from tanks and clearomisers. You are prohibited from charging your vape device on board an aircraft. All liquids must be presented at search in a re-seable transparent bag.

Tanks, Clearomisers & Rebuilables
Separate them from your mod or battery before going through security. If the tank contains any e-liquid, remember to declare it in the same plastic bag as your other liquids to avoid delays with the guards.

Vape tanks and cabin pressure don’t mix very well. Before getting on the plane, empty any remaining vape juice out of the tank to avoid annoying leakages.

If you want to dodge some tough questions at security and/or customs, it might be worth avoiding taking your coil wire, pliers, and multimeter in your hand luggage!

For more information check out these websites:

https://www.gatwick-airport-guide.co.uk/e-cigarettes.html

https://www.gov.uk/hand-luggage-restrictions