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wut if you reversed the part where u put da weed wit the part with where you inhale. I.E. like inhaling out of the pen.

you would suck in water like a straw

GT's right, but it's possible to be done. you'd have to drop a downstem from the top of the bong, like a hookah, you can search for those, we've got threads about 'em, but only have one breathing tube, in your case, a pen.

but like wut if u didnt use water?

then it wouldnt be a bong

Word.