What the hell is this?

[skyscraper]

I just started using a rubber mouthpiece for my e-cigarette and because it is white, I can easily see some crap that accumulated inside of it by the end of the day.
Does anyone have any idea what this is and does it mean our lungs also get full of this nasty dirt?

Even though I am using only top quality eliquid brands, here are some pictures of the crap inside the mouthpiece:

 

[Harlen]

It may be the coloring in the juice ?

 

[Maiar]

It's just the vape condensing in the tube and mouthpiece. This stuff shows up on any tank with any juice, though the coloring is different depending on the juice.
And I wouldn't worry about your lungs being full of it, the lungs are quite capable of cleaning themselves out. And since I've yet to see concrete proof of any cancer causing agents in any juice or vapor, the momentary presence in your lungs shouldn't be a problem.
Mine doesn't show up as well, but you can see a definite ring of brown .... in there, and this is after only 1/4 tank. And a guarantee when I take the tip off there will be more there.

 

[skyscraper]

Ok thanks for your replies. I guess it's still better than tar.