what does it mean when u smell cigarette smoke the of stale tobacco mean? why would i smell cigarette

A cigarette is a visible object

So I started experimenting

The device enables us for the first time to compare responses of human small airway tissues, from both normal individuals and COPD patients, before and after they are exposed to cigarette smoke delivered through physiological breathing outside the human body, explains Donald Ingber, the founding director of the Wyss Institute and the lead researcher of the study

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Quantitative tests measure the exact concentration of nicotine or cotinine, offering detailed information about exposure levels