How to make a gravity bong

This isn't the greatest "how to" video because they don't explain why it works, but it's fairly simple: You're using the draining water from a 2 liter bottle to create a vacuum, thus drawing smoke through the socket and into the bottle. Once the water is completely drained you suck the smoke in from the top of the bottle. It cools the smoke a little bit too, thus making it a little easier on your lungs, because marijuana burns fairly hot. Or so I'm told.
jonnysays...

pffft - pretty weak gravity bong.

Cut the bottom inch or so off of a gallon milk jug. Use a similar setup on top as here, though a bowl + stem from a regular bong works better. A grommet is useful to keep the hot bowl off the plastic and to help ensure a tight seal. Now, fill a sink about 2/3 with water. Place jug without the top into water until water comes nearly to the top. Screw on top with bowl and goods. Light the bowl while slowly lifting the jug until the jug is nearly clear of the water. If you loaded the right amount the bowl should be empty. Place mouth directly over bowl. Push down and inhale. Hard, slow and steady. A spotter is often useful at this point in case you fall down.

Of course, some folks just call that a sink (or tub) hit. So they tell me.

ehh - what the hell. upvote for spreading knowledge.

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