I have played around with vapor a bit. One thing I noticed is that it's cold when exhaled. No matter how hot the atomizer gets blow some vapor into your hand and it feels cold. Ever notice that? Here's another one. It's heavier than air. Take a near empty bottle of water and blow some vapor into it directly from the ecig. (meaning stick the mouth piece into the bottle and blow through the battery side, lots of vapor will go into the bottle). See what happens. The vapor actually sinks to the bottom. Turn it upside down and you can literally pour the vapor out of the bottle. Interesting! I'm wondering how much of it sinks into the lungs and never comes out and just disapates in there.