Cigarette smoke in closed spaces.
D000397:Air Pollution / Q000032:analysis*; D001273:Atmosphere Exposure Chambers; D002248:Carbon Monoxide / Q000032:analysis; D004781:Environmental Exposure; D004782:Environmental Health; D006801:Humans; D008433:Mathematics; D009585:Nitrogen Dioxide / Q000032:analysis; D010316:Particle Size; D012119:Respiration; D012906:Smoke / Q000032:analysis; D012907:Smoking; D013696:Temperature; D013997:Time Factors; D014691:Ventilation
D012906:Smoke; D002248:Carbon Monoxide; D009585:Nitrogen Dioxide