black stuff in cigarette filter spots dots New insights in tobacco radiotoxicity: on the research of 210Po in WTF is this black – Charcoal Filters Are for Suckers

Cleaning the air alone rarely solves it

The HEPA filtration layer captures soot, and ash particles and the carbon layer adsorbs chemicals and VOCs/vapors in smoke

Rinse and repeat

I gave up on aromatics years ago for Va/Per's and had only one aro on the shelf that I went to occasionally and that was Sutliff's Maple Street which has now been replaced by the CB Dark

Tips Air out your room after you are done smoking

Research from the Center for Tobacco and the Environment at San Diego State University found thirdhand smoke residue in 100% of smoker and non-smoker apartments studied , demonstrating how persistent smoke contamination can be even after smoking has stopped