i always leave room for a breath after i pull a pipe, and i inhale deep, then exhale like 1/3 then inhale again, hold for a bit, then exhale

or if im really bored ill recirculate the air from my mouth to my nose, certainly gives me a nice headrush

but i smoke green, so no nasty tobacco in ther, i find i can hold the biggest cones i can pack with no dramas.