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Secondhand smoke (SHS) from combustible cigarettes causes numerous diseases. Policies have been developed to prevent SHS exposure from indoor cigarette use to reduce health risks to non-smokers. However, fewer policies have been implemented to deter electronic cigarette (ECIG) use indoors, and limited research has examined the impact of secondhand exposure to ECIG aerosol.

Indoor air quality was measured at a 2-day ECIG event held in a large room at a hotel. Fine particulate matter (PM) was measured using 2 devices that measured concentrations of PM 2.5 μm aerodynamic diameter or smaller (PM_2.5). Measurements were taken before the event, over 2 days when the event was ongoing, and the day after the event. PM_2.5 measurements were also taken from the restaurant at the hotel hosting the event and a restaurant at a nearby hotel.

During 6 time points when the …