The Tar, Nicotine and Carbon monoxide ceilings (or TNCO ceilings) are the average upper limits on total aerosol residue, nicotine and carbon monoxide contents of a cigarette, as measured on a smoking machine and according to a given set of ISO standards. Because these refer to machine-generated yields rather than the average smoker's intake, these values have often been decried as misleading.
The Tar, Nicotine and Carbon monoxide ceilings (or TNCO ceilings) are the average upper limits on total aerosol residue, nicotine and carbon monoxide contents of a cigarette, as measured on a smoking machine and according to a given set of ISO standards. Because these refer to machine-generated yields rather than the average smoker's intake, these values have often been decried as misleading.
Source: Wikipedia "TNCO ceilings" · CC BY-SA 4.0
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