What would be cool is a way to extract nicotine from tobacco leaves WITHOUT concentrating it, and without having to do a "Breaking Bad". A procedure where the nic never got very concentrated, and where the solvents are reasonably safe to handle.
tobacco is very easy to grow. (It's much more difficult to cure it properly, which is necessary if you want to smoke it). I've grown several crops, and it's grown commercially in Canada and Alaska, so contrary to what many think, it doesn't need a long growing season or southern climate. Kind of like tomatoes (which are in the same family). I have to remember to plant a few this year to refresh the seeds (one tobacco plant will make 100,000 or so seeds, they're microscopic) I even got some specialized tobacco seeds from the Gov't for free under the GRIN program (sadly, you can't do that any more. at least for tobacco seeds). ebay still has lots to choose from.
Anyway, there are all kinds of different procedures for extracting from plants, and many safe ones (alcohol extracts, water extracts, that kind of thing). Haven't seen any tobacco extracts (for nicotine, not flavor) that I would try. It's the missing piece in my Vapageddon strategy.....
Growing tobacco is also, in most places, illegal without some form of "license", for the same reason that making moonshine is illegal. The gub-ment don't get no taxes!