Know what helps?
Big fucking bowls.
Not the amount of weed (though that helps too) but I mean pipes (wooden pipes, similar to sherlock pipes) with big bowls used for tobacco.
Why?
Because there's no wind to blow away the fire. It's just deep in a cave.
Worked for me.
I was toking in my dad's wooden tobacco pipe and it was amazing because this fuckin lil nugget kept LASTING! lol!
Got like a good 10 hits.