Why should I choose a glass bong?
Because you want to smoke some Marijuana?
That's the only reason I can think of that you might want a glass water pipe of any kind. Now, I suppose some people might use them for tobacco or other things, but my understanding is they are primarily used for pot smoking.
As for why you might choose glass over other materials, word on the street is that glass is safer in terms of foreign chemicals leaching into your smoke. Back in the day, we used brass pipes a lot, and recently I've heard that this might not have been a good idea, as some of the metal might evaporate and be inhaled. I know it is possible to evaporate metals because that's how I make some of my glass art, by “fuming" gold or silver onto the glass. So, the idea that metal pipes might be dangerous, isn't crazy, although I've never seen any actual science on that.
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