I read something about this a while back. I don't remember if it was a fact or just a theory but they did give a reason why vaping gets you so high with less weed than smoking. You need to heat the weed in order to extract the THC. The actual range of temperature that is best is pretty narrow. When you smoke, the temps are much higher than when you vaporize, and a good portion of the THC simply gets burned up and destroyed long before it enters your lungs.

The reason a vap is so much healthier is that there isn't any smoke. Smoke contains all kinds of nasty compounds in addition to THC that aren't healthy.