Whether your politics is left, right or centre or some variation on a theme....and if your only concern is Vaping ...and I don't trust any politician ....then remember that it was a socialist coalition led by a labour MEP that led, and ultimately forced through Article 20 (renamed Article 18) of the TPD that effectively bans most of the gear that we use. Denmark has already made it law and the Vaping industry has collapsed.
So, when it comes to the UK interpreting and implementing the Article here, I, for one, would prefer anything but a Labour victory. Just look at the Welsh experience.