You did good OP! I did the same for my younger sister pretty much. She's still just under the legal smoking age, but our mother tried all she could to get her to stop smoking short of pulling her from school, where she was getting the cigarettes. She finally granted me permission to get my sister vaping instead. Decided that some harm reduction was in order at this point. Even sending my sister to another school would have only slowed her down a bit. There is always a kid who knows how to get cigarettes and sells them, or even gives them away.
We originally set her up with two variable volt egos, two Evod like clearos, and a bottle of juice she liked of mine. The clearos broke down rather quickly (they were cheap generics) and she went back to smoking because it was easier to bum a smoke then to research replacements. I then hooked her up with a couple of Mini Protanks. They lasted longer, however with the pretty glass tanks I think her set up became a target at school, and both egos with Protanks on top were stolen. So finally I set her up with a Petal MVP 2, the matching tank, and 5 other clearos in plastic and glass. This is less of a target due to size I imagine. She's been with this set up for quite some time.
Through it all I've been sending her all the juice I wound up not loving from my Zamplebox subscription, trades, and purchases. Works out well for both of us as my husband hates clutter and doesn't understand my juice obsession. He has his all day vape and has the same juice in every topper he owns.
Which brings me to what I've invested into him to get him off cigarettes. He likes to claim he doesn't enjoy vaping. It's just nicotine replacement. It's not "cool" enough for him. In fact, he considers it the height of geeky. Until I upgrade to something he plays with in the middle of the night while I'm sleeping, and then decides he needs it. Generally take a few nights of playing and draining my batteries to make the decision, and then suddenly his current set up is just not adequate for his needs. If it isn't pink and girly, and if it isn't a box shape, he has no issue with simply taking over what he likes, leaving me with his old set up, or my old set up. Naturally I started buying pink, but he even started playing with my pink Provari at night, and then the iTaste's weren't working right suddenly. I had to buy him a black Provari off the classies.