From FAQ:
The Lung
A
smoking Aparatus created by myself late one
night when
bud was scarce, and an
efficient,
hard hitting device was needed to make the most of the
weed we had. It is a close
cousin to the
gravity bong in the sense that it makes use of the properties of a
vacuum, yet requires less work and is more portable. This device is capable of producing a large hit with little to no loss of ANY
smoke.
Materials needed:
One 2-liter plastic
bottle*
One large ziplock (plastic) bag, big enough to fit around a 2 liter coke
bottle.
Tin foil or a
bowl for a
bong (slide).
Some
strong tape, duct tape or the plastic shiny brown tape works well.
A thumbtack or pin.
A
knife,
scissors, or something of that matter.
*(any size plastic bottle will do, but adjust
plastic bag size to suit)
First, cut off the bottom quarter of the 2 liter bottle, right around where the
label would end. Then, cut the ziplock off of the bag (if it has one) right where it ends, so you still have the majority of the bag. Firmly tape the
plastic bag around the newly cut open
bottom of the 2-liter. tape it around REAL tight, this is
very important, the seal must be
airtight. The length of the bag that hangs off of the
bottom of the 2 liter should be just enough to fill the
bottle if you were to
suck on the top of the bottle. hold it tight and move the bag around to find the best space for it. place a
piece of
tape in
The center of the
bottom of the
bag, so it is stuck to the front and back of the bag, with some excess hanging off the bottom (this is the handle). Next, take the cap of the
bottle and but a
hole in it that is .5 to .75 of an
inch, if you are using a
bowl, make it big enough to just
squeeze through, if there is extra space, tape it or use gum. If you have only tin foil, first make a
cylinder of tin foil with the center completely open that is the same size as the hole in the
cap, and about 2 inches long. Stick this halfway through the
cap, then pull all the tin
foil coming out the top flat on the top of the
cap to cover it as much as possible. this is to cover the plastic, so you are not burning plastic into your smoke. Use the tin foil to shape a
bowl on top of the cap. The best way to make a
bowl is to wrap foil around the cap to make a simple tube going to a larger
bowl, completely open at the bottom, then take a small
piece of foil and punch as many
holes in it as you can while still keeping it movable. push this into the
bowl and now you have a nice
screen.
To use this, all you do is take off the cap, then inhale to pull the bag into the bottle. pack the
bowl, screw the cap on (with the
bowl) light the
bowl and pull the tab down nice and slowly, the bottle will fill with smoke. once the bag is pulled down all the way, take off the cap, and either inhale real hard or just pushg the bag in and let it force its way down.
You only need to pack small
bowls with this
bad boy, and it will wreck you up. Smaller ones can be made with 20oz bottles for
portability. They get
nasty after a week or so of use, but they are
cheap, and you can re-use the
bowl.