Can’t really tell from the picture whether that’s smoke IN the bong, or a coating on the glass.
In my salad daze - been there, done that ... thats smoke in the bong !!!
The 60's were very,very good to me ...
The only way for smoke to remain in the tube is for someone to draw the smoke in and hand it to the kid. I really doubt that someone would return the hot bowl to its slide first if this is what they were doing.
Not that this makes anything any better, this picture is disgusting, I mean that.
For the record... I found out from my brother about how this bong thing works if anyone asks...