This wouldn't be like alcohol prohibition, where anyone could make it and the worst you had to worry about was hooch from lead-soldered radiators. Extracting nicotine from tobacco is an expensive and dangerous process most experienced chemists/chemical engineers wouldn't even try at home. vaping Big tobacco's, carcinogenic pre-filled cartomizers, or even going back to smoking, will be far safer than buying questionable black market nicotine liquid, much less trying to DIY it. If you can't zero-nic, you need to be hoarding nic base now or resign yourself to vape whatever Big Tobacco sells.