an exerpt from a web page devoted to getting the best of your stash!
From the majority of the reading I've done, THC is a slightly unstable substance at best, being broken down in varying levels by things so incosequential as sunlight, temperature extremes, improper humidity levels, and so on. This leads me to believe that the coolest burn possible is probably best. In addition, the entire vaporization theory would indicate lower temperatures being better, claiming that other components in cannabis (presumably the undesired ones) ignite at higher temperatures than THC and thus can be avoided by burning at a temperature only hot enough to ingite the THC.
Here are some facts about THC's response to heat to help you decide for yourself:
The Merck Index lists the boiling point of delta 1 9Tetrahydrocannabinol as 392° F
Purified cannabinoids were noted to boil at 302° - 356° F by Wood, Spivey, and Easterfield
Merck Index lists d1 9THC as boiling/vaporizing at 392° F
A large amount of THC is lost to after-toke continuing combustion, which would stop more quickly if the cannabis never reached the higher temperatures
the answers are out there!
this information has been provided out of technical and professional interest only
enjoy
dave bev