A bong is a filtration device usually made out of glass and primarily used for smoking marijuana.

A diagram of how a bong works.

See also:

• alcohol
• drugs
• cannabis
• cocaine
• heroin
• lsd
• magic_mushrooms
• marijuana
• bong - A device used primarily to smoke marijuana.
• pot_leaf - A leaf like one found on a marijuana plant.
• stoned - A general tag to describe "being high" and usually associated with marijuana high in particular.
• methamphetamine
• opium
• smoking
• cigar
• cigarette