I've been exchanging a bit with peers on a nasal snuff forum and one member offered this in posts about the electronic cigarette: "It sounds like the vapor is probably glycerine. It carries flavors pretty well and makes nice fluffy white clouds that are thick enough for smoke rings. You can make your own juice for this system with a little effort. For a test batch you can use ten grams of any tobacco you choose. Simmer with a cup of water on very low heat for 20 minutes. Strain liquid through coffee filter and reduce over very low heat until almost all water is gone. Remove from heat. Dilute tobacco essence to taste with pure, food grade glycerine and have yourself a "smokeless smoke."" Hmmm. These are very inventive guys, heavily into creating their own nasal snuffs, own flavors, etc. They almost come off as survivalists! I might try that recipe -- then add a food extract flavoring for taste. I have some nasal snuffs I don't like and could start cooking with those.