I'm rather intrigued by such a prospect; despite the fact that I haven't touched a smoke-producing unit before.
How do you imagine you will create your own?
Do you have an arboreum to grow plants in that you will extract the juices from?

It's not too hard really. To make an e-cig juice all ya need to make is a base, that can be as simple as just using vegetable glycerin or mixing it with propylene glycol, making a flavoring mix from various extracts and flavorings, and if your adding it the nicotine. the last part is where the mix can get a lil borked if you don't know what base the nic is in and how strong it is. As for the flavorings not sure on making or extracting my own but there's thousands of them on the market. Hell might be cool to try and make an organic e-juice in respect to the flavoring but I'm not sure on if I could call the mix as a whole organic seeing as most of the other stuff isn't by nature.