VG and PG are water soluble. Whcih also means it will be readily and easily absorbed into your bloodstream. If not, then it gets absorbed by the mucous that line the walls and other stuff in your lungs...(I'm trying to be as untechnical as possible). Long story short, you are doing as much harm to yourself as you would if you put you head over steaming water.
minus the heat of course.
I'm sorry, I meant that with vaping the nicotine is primarily absorbed in your mouth.
Well, not primarily but its also important. Since the transport medium of nic in vaping is water vapor... which unfortunately is ten times bigger on a molecular level than burnt tobacco smoke, we absorb less nic with each puff of vaped juice. So having the vapor sit a bit in your mouth, then taking it to your lungs and expelling from mouth and nose is a good way to maximize your exposure to the spiked vapor.
On another note, though I am not sure but its my educated guess... water vapor dissipates way faster than smoke. Probably why if you puff and leave it in your mouth for a bit no vapor will come out at all. a good way to maximize the amount of vape expelled if you are into lots of vapor and stuff; would be to direct inhale, that is inhale as you draw in one action... this could also be a good way of letting the vapor sit in your lungs longer.
This community is def. doing more constructive inquisition and collective research regarding personal vaporizers than any organization in the world is.
Yes we are.... and saving the BT companies hundreds of millions in R&D while we are at it

, whenever one of us gets to the bottom of something like this, they will probably all toast to themselves and probably have a team of ppl collecting notes and making observations of all that we guin.... i mean vapers are going through.