Hi and welcome Balph.
So you are vaping to try to stop smoking? I think that's what I'm reading.
"...stocking up, which can't go on forever..." If you're speaking of stocking up on Juul, there is a stay on the FDA's ban of it, so it will be around at least a while longer, but there are more effective ways to stock up, and IMO Juul is an expensive way to vape. I would say you need a starter kit that includes two batteries to rotate, recharging cable, glass tanks, spare coils for your kit. I think there's some agreement in this forum that Smok is not the most reliable brand. Eleaf is my favorite, but I quit smoking with Ego-T, then the better Ego twist. Most of all, you need to stock up on nic base, as much at a time as you can afford, and as much as you have space to store. Flavorings are on the more fun side of experimenting, but wherever you start, you'd better start now.
I wish you the best of vaping, and hope you can leave cigarettes behind.