Who here hotboxes? I'd have to say that by far is the most effective way of increasing the highness, me and my friends prepack 2 bowls and sit in my pitch black closet and do nothing but get it smokey like smog and when we get out its so smokey you can't see. It's an exellent technique as when you're in there, you breathing almost nothing but cannabis! The only draw back is since it's my closet all my work clothes wreak of weed!