For Giddy -- if they're too weak-willed to avoid smoking (even in vaping form) - there's little hope for them. Smoking killed my dad when he was 50, and I'm pretty sure his secondary smoke killed my mother (similar age). Luckily when I tried it as a teen, I didn't like it, and that was with smokers everywhere on TV and films.
The midwife is of course quite right, the accounts from USA are that vaping causes masses of problems, albeit rather different from fag smoke. However lots of folk here think vaping is an innocent harmless release. Personally I find the sickly stench quite disgusting.
I'd be another vote for Soc Services, I'm afraid, see if a visit wakes them up to the dangers?