Who would've thought stoners might forget to do a little bit of cleaning?

According to a new study, it's filthy to hit someone else's bong or pipe.

The researchers found the average bong they tested had 1,304% more bacteria than an average dog food bowl, 530% more than a cell phone screen, 90% more than a GARBAGE DUMPSTER, and 50% more than a public toilet seat.

Read more at BroBible.