WeedMan you're referring to THC loss prior to getting it into your lungs. The question is how quickly the THC that is delivered to your lungs is absorbed. Tokingfool, VapedG13, and Sandm4n all disagree with me and say that vapor=smoke in absorption rate.

Quote Originally Posted by tokingfool
If both the vapor and smoke are absorbed through the lungs, both will hit the blood stream in the same manner at the same time
To be completely accurate, my statement was vapor is "not as readily absorbed as the THC in smoke".

SMOKE
Studies done in Australia indicate that 95% of the THC in cannabis is absorbed in the first few seconds of inhaling.
THC Club - Cannabis Users Guide

VAPOR
Interestingly, the Leiden University study found that as much as 30%â??40% of inhaled THC was not absorbed by the lungs and simply exhaled. However, they did not find large individual differences in the amounts exhaled. Cannabis Vaporizer / Vaporizers FAQ