Regulated how, by what agency? What exactly are the restrictions?
FDA's New Regulations for E-Cigarettes, Cigars, and All Other Tobacco Products
Liquid nicotine is a product made from tobacco, it's regulated by the FDA under the TCA.
The only instance where it wouldn't be regulated is the point that skoony tried to make.
If you grew your own tobacco (not regulated) and you extracted your own nicotine from that tobacco (not regulated), you could use it for DIY and the TCA would have no control over you.
However, once you mix liquid nicotine with a regulated product that you'd have to purchase (PG/VG/etc), you're now considered to be a tobacco product manufacturer and the FDA could make you register as such....even if it's for personal use.
The only way around the TCA is if you never have to buy any of the ingredients, but unless you're a lab specialist that knows how to make liquid nic, PG or VG...you're stuck.
It's for these very reasons that this topic comes into play:
E-Cigs Are Going Tobacco-Free With Synthetic Nicotine
While I seriously doubt this would ever happen, the very same could be said for extracting nicotine from a different source, like eggplant. But you're still stuck cuz you'd have to mix it with a carrier in order to vape it.
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