These studies suck. What was the coil temp? 3.8v? What was the power level? I'll say this, for most light-use coils, 3.8v will torch the ever living hell out of the fluids, burn the wick, and impart a foul taste so bad you'll throw the coil/wick assembly away if it's a replaceable unit. Example, I have a 0.16 ohm quad-coil unit set to 75w, and it's putting 3.46v through the coil to get that rated power. They've got to be pushing over 450F on the coil, and at that temp, it will burn a cotton wick, rendering the coil useless unless it's rebuildable. These studies are funded by people that have a vested interest in either A) government overreach, B) the tobacco industry itself, or C) the nanny state (but I repeat myself).
None of this is valid. I've run the output of my vaporizer (a Wismec Reuleaux RX200 with a SMOK TFV4 tank) through the local gas spectrometer at the college around here, and damn if there aren't all of five chemicals: water, vegetable glycerin, flavor, menthol, and nicotine. Exactly what's on the label. Surprised? I'm not.
Lies, damn lies, and statistics.