How long do I have for getting DIY stuff is vaping going away or not I here so much but don't know what is real
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Honestly, nobody really knows. The safe thing to do? Order a few liters of nic and stash it in your freezer. Read up on DIY. It's dead simple to do (low chance of you dead unless you start swigging it). As long as you have that, the rest will always be available such as VG/ PG, and most flavorings. If you like any tobacco derived flavorings, those may also be at risk. no, I'm not sure how to best protect them for the long term, probably refrigerator (if someone knows better, or it should be the freezer, please pipe up).
With your nic stash set, you can turn to hardware. There you might have until 2018 to finish stocking, but some things may become harder to get such as new hardware releases. Simple protection. Mods that use replaceable batteries so when the battery will no longer hold a charge (happens to all Li batteries) you swap in a new one. Tanks preferably rebuildable. I prefer RTAs as they're made to build on unlike the RBAs you can get for factory coil tanks. Those are small and can be finicky to work with.
Everything else, wire, cotton, batteries, will always be around so no point piling that in the back of the closet too.