Well first i think vapes burn at a really high temp so that all the thc comes, so u need less weed.
Second a bong hits way better then a joint, i personaly don't like smoking joints, I i can load .1 into a bowl and smoke it and i'm good for hours. but a joint is at lest .3. I find glass easier to smoke (as long as its clean i use screens to stop ashes from clogging my pipes, and i clean my bong regularly, it still looks brand new and smokes like it too) and there less waste. smoke a whole bowl, as oppose to a joint still burring between tokes. And on top of all that i suck at rolling joints anyway.