When I used "The Lung" it was one of the biggest hits I have ever taken.

This is how my friend made it. He took a 2 leter bottle of soda and cut off the last 1/3 from the bottom. Then taped a plastic grocery bad to the end of the cut off bottom. And he made a bowl on the top with the cap and tinfoil. You stuff the plastic bag inside the bottle. Then you lite the weed and slowly pull down on the plastic bag from inside the bottle. By the time u can't pull anymore, the whole bottle is full of smoke. Unscrew the cap, and take that hit. Its pretty nice.