I'd guess at tar from cigarettes. Check the forum's, I am sure there is another one like this with others coughing up black. I'd vape for sure and stop the cigs--if you possibly can.

Any chronic cough needs to be checked by your Dr. and I am guessing your lungs are going through a periodice cleansing! Vape and you'll see a difference, is my guess. It surely isn't marinara sauce!

Your lungs do have a lining in them that is damaged by smoking. The lining is to filter harmful things out. It starts in your nose with hair and moves right on through the intake valve's-so to speak! Since you are reporting no fever or any other symptoms--if it were me, I would just work on cessation of cigarettes and vape as you plan. Then if it persisted, or if I had a fever or any symptoms continued to bother me, go to my doc.

Good luck and let us know what you decide! PR :dance::dance::upsidedow and help that crap out of your lungs! :vap_rasta: