Call the airline you'll be flying and ask them, to be sure of the latest update.
The last time I flew to Europe I took my vape supplies in my carry-on. They don't want the lithium batteries in your checked luggage in hold. If you use open systems, your liquid needs to be in the 3 oz container in the silly baggie in your carry-on. If you need to take more than 3 oz, use the travel size shampoo and conditioner bottles, wash them out, leave the labels on, and they'll never know they're not shampoo and conditioner.
But check for updates. I haven't flown in a while.