I got back from a UK to USA flight, I took a Vapcap M and a Healthyrips Fury 2 and they both got through with no issue at all, even though the Fury was quite fragrant! They swabbed my bag on my journey out, you could see the screen on the machine saying 'scanning for explosives' or something similar. I really don't think they care if you have a smelly vape on you. It might make them look closer through the rest of your bags if they spot it, but if you're not carrying any meds then what can they really do? On another trip, Heathrow baggage inspectors quizzed me about some Arizer Solo stems but not the vape itself. I just told them it was e-cig stuff. They were fine with that and let me go. This doesn't apply to the UAE though, never take anything herb related if you're going there. I remember there was a guy who had 0.003g stuck to the bottom of his shoe and ended up with a 4-year sentence!