This is a thread about nicotine absorption by vaping. The information I got about lung absorption was from a thread off this forum which I found on the search engine after looking for information about nicotine hits. Basically, I think the E-cigs would be perfect if they delivered the same hit as normal cigarettes. Whether this is done by freebase nicotine or changing the pH or whatever, I don't know.
Don't believe everything you read on this forum, and don't freebase nicotine.
There, I've done my part.