man i thought i was the only one its so wierd its just like he said its specs of gray and black and i dont smoke cigs at all...it happens even more when i smoke blunts though and alot of it is probably from my work i do bodywork on cars which means alooot of dust and fumes n yuckness i will get home n blow my nose n it will be bright greenish yellow from the bodyplastic i should really start wearing a mask