Realistically, using an ozone machine is part of the final treatment after physical removal is completed to eliminate any residual odours mostly lingering in the air space
Interestingly, I feel like you do get some whispers of strongly steeped black coffee on the finish as well, something like when the astringent bitterness of a brew has faded and left its nutty, oily flavours on the palate
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Some people experience increased coughing as the lungs start expelling built-up residue, which is a sign of healing, not harm