End of the driveway, huh? That's a little paraniod. Nobody is going to say OK because of the liability. At least, being a physician, I'm not going to. So, consider that glycerin is a common food additive and harmless to those around you. When you vape, it goes to the bloodstream (doesn't matter if you inhale it or ingest it), and is metabolized into glucose. Flavorings go the same route as if they were added to food (except tobacco). Nicotine is present in exhaled vapor to such an insignificant level that I wouldn't be concerned. In real cigs, most of the nic is oxidized (burned up) & you get about 1 mg. inhaled, of which a surprising 98% is absorbed, and about 2% exhaled. The problem with tobacco is all the other crap exhaled. While it hasn't been studied, I suspect that the vast majority is absorbed with e-cigs too, and extremely little trace amounts are exhaled. I would stay away from tobacco flavors since they come from an extract from tobacco and vaporizing it (heat) may well produce unwanted chemical bi-products of oxidation. In my opinion, vaping unflavored (or food flavoring), med-low nic, with a glycerin & distilled water base is about as harmless as steaming vegatables on a stove. The anti-smoking lobby has been very effective in scaring folks into over-reacting. Even a real cig smoked in a 100k sq. ft. super market is far less significant than the fumes you breath walking down the cleaning product isle. If you are real concerned, stay out of traffic jams....that's where fumes get significant.