Yeah I'd have to echo pretty much all that was said here -- do you smoke? If you don't, why the hell do you want to suck on a tube to get vapor? You really WANT a nicotine habit, or just to look cool to your friends who vape, or what? If you don't currently smoke, it really makes no sense.
If you DO smoke... try smoking in their house, see how they feel about THAT -- bet they'll be more amenable to vaping, if the result of NOT vaping is stinking up their house.
Or, get a PO Box. Cheaper than getting your own place, by far. Or just bite the bullet and get your own place where YOU make the rules -- but I realize that's a hell of a lot easier said than done. So -- PO Box. Or, just go to a B&M if you have one nearby, and buy the stuff locally. And yeah, it's their house, so they can set the rules for what is done in the house, but as a legal adult yourself, they do not have the right to destroy your stuff. But, the surefire way to make sure they don't? Move out.
Andria