at baking temps it is not destroyed too low temp. thc has a temp which it boils off the good vaporizers try to be right above that. heat does seem to aid in making thc more available when cooked and ingested or at least helps the fats and oils release it. plant cell walls are hard to process that is partly why we cook some of them. i have unfortunately learned the hard way that raw cannabis dry or not does nothing when eaten. smoke the kief or make cannabutter you dont want wasted kief up your nose