I have put up dozens of auctions for vape gear, even a whole bunch of liquid. Never had a problem like that tho.
Always worked flawlessly like any other item I put on eBay.
Only restrictions:
- it can only be marked as "new", there is no way to put something up as "used"
- shipping has to be with an option that verifies, that the buyer is 18+ (jsut has to be labelled as such in the auction, the actual shipping can still be whatever you want)
But maybe eBay Germany is different than in the UK in terms of restricitions.