That's interesting, but that is a question that your doctor will be able to help you with much better.
I have a sneaking suspicion the two are connected in some way, though. I guess the question is, how long after the end of chronic exposure to inhaled air pollution do your lungs take to a) start rejecting the foreign matter and b) completely finish cleaning it out.
If your doc has any insights, I'd be very interested to see this thread bumped again.
stinkyattic Reviewed by stinkyattic on . Black/Grey Pieces in phlegm Me and my buddy are pretty much daily smokers. Now i smoke around the same amount as he does. Over the past year or so he has developed phlegm in which he coughs out, and it contains like black or grey little pieces in it... He has asthma, and his dad smokes like a chimney (in the basement away from everyone). He stopped smoking all together, and started vaping... Is this from holding in hits? Is it from exposure to cigs? ... Does anyone else have or heard or this? What could that Rating: 5