蔡医生: 我是在某卷烟厂工作的工人,已有20多年的工龄。最近工厂组织我们工人进行体检,医生说我患有呼吸系统疾病,并且尿中尼古丁含量显著增高。请问,卷烟生产中有些什么职业危害? Dr Choi: I am a worker who works at a cigarette factory and has worked for more than 20 years. The factory recently organized our workers for medical examinations. Doctors said I had respiratory diseases and the nicotine levels in the urine were significantly higher. Excuse me, what is the occupational hazard in cigarette production?