Gene has hit the proverbial nail on the head....leaves have a so much " vegetation" that it makes it harsh to burn. The densest part of the plant is certainly the buds. There are members on here that do little to no trimming....hell, I bet
@trailanimal would probably smoke some trim if he was in a tight spot. Most of us like to cook with the trim....personally I turn some of it into e-liquid so I can vape it. You can also make tincture, canna caps, etc.