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Cigarette smoke contains fine particles along with harmful gases and chemical compounds such as carbon monoxide, benzene, nitrogen oxides, and formaldehyde

Researchers at Jefferson Health in Philadelphia performed computed tomography (CT)-guided stellate ganglion block (SGB) in 54 patients who had long-term parosmia (impaired sense of smell that can lead to a distaste for once-like foods and drinks)

Available from the Legacy Tobacco Documents Library, University of California, San Francisco

Of course, when buying a HEPA Filter, it is important to take into account the MERV ratings, (Minimum Efficiency Reporting Value) which determine a filters overall efficacy versus coarse and fine particulate