Quote Originally Posted by Ganj
I always believed it was the burning of the THC that got you high.
That is not true. If were so, weed edibles, green dragon, and THC pills (marinol) would not work. In fact, the THC must be unharmed (not burnt) to got you high.

To the OP, while the THC may be burnt when it touches directly the flame, most of it is only vaporized by the heat. Most of THC is into the bud, and thus does not touch the flame directly. When you toke, the stream of hot air from the flame and from the burning weed pass through the bud and evaporates some THC from it, which is inhaled and got you (and everybody else) high.