Just kids injecting marijuanas, not a cell phone in sight.

You can have your drugs, or you can have Koffing blowing smoke. Make your choice, but choose wisely.

Or it serves as a way to dissipate the smoke smell when breathing out. In my college days, we called it a "sploof."

Maybe it has a valve that redirects incoming smoke through Koffing's "ports"? That's just the kind of thing I would do with it if I were high!