Here is my theory. Vaporizing is not so harsh and leaves your throat feeling fairly unaffected. Smoking tears your throat apart and creates cracks and sores that offer direct contact to your blood stream. Burning gets the THC into your system faster and easier resulting in a more intense body high. Whatever can't get absorbed makes it to the lungs like usual but I would think there would be some delay. I think that vaporizing forces all the THC to go into your lungs which distributes the effects differently then direct contact with the blood stream. Haa. Or not