I once heard that when you light the weed it will burn some of the THC and you will lose more then if you had the weed in a vape where it sealed it off and you have a consistent temp, and you can increase the temp getting more cannabinoids then that is the better high. THC and Cannabindoil (sorry if misspelled) Are what give you the high feeling, Cannabindoil increase the feeling of the THC.

I could be wrong on this id have to find the research that supports it