Bong, the Myth.

   Step 1: What is a Bong?

   A bong generally consists of a long tube (known as a chamber) with an open top and a stem with attached bowl protruding from one side. The base of the chamber is meant to be filled with water. Most bongs also have a carburetor of some sort that allows smokers to completely clear the chamber of all smoke. This carb sometimes comes in the form of a sliding stem, that is removed from the bong at the end of each hit. A carb can also be a simple hole in the back of the bong that is covered with the thumb or finger while taking a puff, and then unblocked at the end of the toke.

   A bong (also known as a water pipe) is one of the smoothest ways that you can smoke weed or tobacco, second only to a pot vaporizer. The design of the bong allows smoke to travel through the water in the chamber, cooling it off before it reaches the throat and lungs of the user. Bongs may also be filled with ice for even more of a cooling effect. Bongs range from the very simple (such as soda bottle bongs) to complex, and are often artistic creations blown by glass masters.

   Step 2: How to Get a Bong

   Of course, before you can start using a bong you will need to get your hands on one. buying a bong is a multi-step process, and you will need to take the following into consideration:
   What type of bong do you want? You should look for one that fits comfortably into both your budget and your living space. Glass bongs are visually appealing and offer a pure smoke as they do not emit any fumes, but these can be expensive and are easily broken. Acrylic bongs are sturdy and relatively cost-effective, but you may be able to taste the material as you toke.

   Step 3: How to Smoke Out of a Bong

   Now that you know the anatomy of a bong and where you can purchase one, lets get to the fun part -- using your bong. Here is a step by step instructional guide:
   1 - Fill the bottom few inches of your bong with water (to an inch or so above the base of the pipe stem).3 If you want to achieve the coldest hit possible, add some ice (either cubes or crushed ice will do) to the water. Now test it to make sure the water level is right. Place your mouth over the top of the bong and inhale. It should bubble up, but you should not get any water into your mouth.
   2 - Take your weed and break it up, discarding any seeds (you can grow more pot with these if desired) and stems. You should end up with relatively small pieces. You may use a pot grinder if you wish.
   3 - Fill the bowl with your pot.
   4 - Hold the bong firmly with one hand. If you have a carb in the back, be sure that it is covered.
   5 - Put your mouth onto the top of the chamber so that your lips are inside the rim.
   6 - Light the weed with a lighter and inhale at the same time to fill the chamber with smoke.
   7 - Uncover the carb by removing your thumb or finger, or by sliding out the stem.
   8 - Finish inhaling all of the smoke in the chamber.

source: http://www.mahalo.com