Umm..I guess I'm fucked then lol, because unless I'm smoking a joint/blunt or glass pipe I always make sure the smoke gets thick and yellow. Every time I smoke the g-bong or my bong I made the smoke always gets thick and yellow. Not like solid yellow, but yellowish/whitish. We cough because all that smoke is inhaled at once.. It means you're gonna get fucked up, simple as that .

edit: I don't know if the smoke is yellow without there even being a build up. But if you have a lot of smoke and it's yellow I don't think it means it's stale because my bud does that and I never buy stale/shitty weed.

Lol just gave me an idea. I'm gonna take a pic of when the g-bong is filled with smoke .