The WD40 taste is actually nicotine free base. Some vendors adjust the pH to be a bit lower to create more nic salts, which cuts down the nic taste/smell (Vermont Vapor unflavored has ascorbic acid added), but many do not do this. My unflavored MFS 100 mg VG is probably free base nic, as it has a bit of that smell/taste, but it goes away when I mix up a DIY with flavoring.
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