I don't want to bash anyone's product, but there are several problems with the "lung juice" type products.
For one, and this is important, most of those ingredients have no proven effects. It's basically adding a witches brew of substances from a crude extract, which likely have little or no benefit and do have proven negative side effects. Lobelia for example is well known for it's negative effects when used to excess. With no standardization in the extraction process you are taking an unknown dose of a compound known to have very dose dependent effects. Perhaps the main point though is that lobelia HAS been studied as a stop smoking aid. It was found to be completely ineffective, yet herb dealers continue to represent that it is used to help people quit smoking. They know it doesn't work, yet they keep pushing it for that purpose.
Another point is that these additives are crude extracts. And I don't mean "crude extract" as a negative term, it's the proper chemistry term as there is no selective extraction procedure or purification steps. When you take a crude extract (usually alcohol) you are basically extracting all the polar compounds from a plant. If you try to concentrate a crude extract what you end up with is a sticky, gooey tar. One of the main reasons I switched from analogs to vaping was precisely to avoid inhaling plant tars. IMHO it is very questionable to to promote a product full of plant tars as healthier than their non-tar counterparts.
The third main strike against crude extracts is that they simply aren't concentrated enough. If you concentrate them too much you'll end up with too much tar and it will kill your atomizer and be unhealthy to inhale. Getting an effective dose from the small amount of liquid inhaled through an atomizer isn't easy and you just can't really get a crude extract of most herbs concentrated enough to get a therapeutic dose into the half ml or so that you'd need to in order to make it effective.
Finally, using a shotgun method of combining a random mix of herbs reported by random herbalists to have some sort of effect doesn't seem like a very effective method for much of anything. By using multiple herbs of questionable benefit you're just further reducing your dose to tar ratio. You also end up being completely unable to assess the benefits of any one substance. And one thing this field really needs is legitimate research. You can't even produce a proper case study by starting out "So I mixed a bunch of herbs together of unknown dose, with an unknown amount of dose delivered..."
My initial research indicates that the active fraction from mullein leaf seems to vaporize well. I'm planning to have animal tests in progress in about three months. If anyone's wondering why not skip straight to humans... well I can't exactly inject people with an inflammatory agent and see how much mullein reduces the edema. Bacteriological tests should be finished before then and that would be the point to let people jump in with their own research. So stay tuned, I'll post results here in the next few months.
-Jake
