Exhaled smoke increases the carbon monoxide in the air, causing watery eyes, sneezing, coughing, and shortness of breath, according to Lin Jen-H'un a biochemistry professor at National Taiwan University.
「吸菸者吐出的菸，使空氣中的一氧化碳濃度增高，引起流淚、打噴嚏、咳嗽、氣喘等不適的症狀」，台大生化研究所的林仁混教授說。