Now, I could be wrong on this because I'm not a scientist (and I don't even play one on TV), but my understanding is that Runyan is claiming that over 98% of the nicotine is absorbed and the exhaled vapor contains virtually no nicotine.
They may be right but I just dont see how thats possible. If the vapor doesnt settle on your lungs it cant possibly transfer the nicotine. If you exhale vapor then that vapor you exhaled didnt come into contact with any part of your body because when it touches something it settles on what ever it touches due to it being nothing more than micro fine liquid droplets.
Ahhhh well it is just a theory that makes alot of sense in my mind (god help us!) 8-o