I believe it's more complicated than you think to come up with general answers.
Are the results from a juul or other device that runs at a single-digit wattage going to be comparable to the results from an rda run at a triple-digit wattage? Will there be actual vapers present to sample the setups to ensure that they're being run in a realistic manner and not overheated and dry puffed? What PG/VG ratio will be used? What flavorings will be used in the liquids and at what percentage?
We know from experience that such studies can show very bad results (formaldehyde, etc.) if the devices are pushed too hard, in a manner that real vapers simply don't. We know that some flavoring ingredients have the potential to be problematical, and I don't just mean diketones.
The variety of gear, liquid compositions, and today even nic (salt) formulas, make this a far bigger task than it appears at first glance.
Wasn't there a study done that ANTS tried to bury where they did an air quality study in a vape shop that vaping was allowed in? If I recall that air quality test came up clean.. very much so.
I think what they have a more difficult time with is what is going directly into our lungs.. because as you said, that can wildly vary..
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