It wouldn't be a bad thing, if analysis of e-liquids established the basics before leaping into the molecular analysis of the chemical constituents.
What I mean is, a good place to start, as far as establishing potential health issues, would be to back track to simple agar plate analysis to rule out, or confirm, the presence of any potentially pathogenic, virus's, bacteria, moulds, and yeasts and determine whether any of these are present at all and whether e-liquids are potential carriers. Get that done and dusted first, it's cheap and easy analysis, then move on to the more demanding stuff.
My hunch is that e-liquids are a sterile environment, but I'm not a biologist.
Speaking with someone in the know at ecig wizard recently, they said they had a wide range of juices tested for a range of things to determine how safe eliquid was as it got to the currently accepted 'use by date'
In their tests they all came back fine and dandy to vape even beyond 2 years and the only thing of note within the eliquid was the breakdown and potency reduction if the nicotine level.
Eliquid is not a good environment for bacteria or disease to survive and when you vapourised at high temperatures it makes doubly sure.
They have since started printing 2 year use by dates on their range - something we are likely to follow too and already give 18 months on our latest batches.
In our case for example - something I know is mirrored by the likes of Manabush and others, we use a pretty nifty cleaning product that has a list of things it kills that woukd impress anyone. It's used for worktop cleaning, diluted as detergent, rinse aid etc. If anything gets past that and into a bottle of bactericidal eliquid I'd be shocked.
^^this
we have started with the 2 year date already Leigh .. as per advice by the same bod
Did you like the special cleaning source applicator we sent you ?