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Glass drill bits are the best way. The other easiest way is to not drill glass. Run the downpipe from the opening in the top. You will need to also run a straw or tube or something to suck on from the top.
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"All the people from high school that I thought would be cooler if they smoked now smoke...and they're much cooler." - A friend of mine spring break his freshman year
Everything in moderation...including moderation.
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