Whenever I get a new pipe, or one of these , theres some ash I end up inhaling the first few times but after a nice layer of resin builds up inside, the ash that breaks loose ends up sticking to the inner wall saving you from hacking up a nasty mess. Its like one of those sticky fly catchers,works pretty good.
Yeah my ash pulls through sometimes especially now that I have a shitty screen with huge holes, I gotta be more careful about how hard I inhale. (bought the wrong type, I guess) When I unscrewed the pieces of my pipe, I noticed the huge amounts of resin building up and also, the black specks all over it. Definately ash and tar, stuff like that. I find that putting my tongue in front of the mouthpiece part when I inhale blocks stuff from getting into my lungs sometimes. It sticks on it and I just spit that shit out.