烟草危害是当今世界最严重的公共卫生问题之一[1-2]。吸烟和被动吸烟是肺癌、慢性呼吸系统疾病、冠心病、脑卒中等多种疾病发生和死亡的重要危险因素[2-6],尤其是对正处于生长发育阶段的青少年。有研究证明,青少年吸烟不仅会降低大脑皮层的活动,且开始吸烟年龄越小,成为烟民的可能性越大,成年后患癌症的概率越大[7]。我国青少年尝试吸烟率和现在 Tobacco hazards are one of the most serious public health problems in the world today [1-2]. Smoking and passive smoking are important risk factors for the occurrence and death of various diseases such as lung cancer, chronic respiratory diseases, coronary heart disease, and stroke [2-6], especially for young people who are in the stage of growth and development. Studies have shown that juvenile smoking not only reduces the activity of the cerebral cortex, and the younger the age at which smoking begins, the more likely it is to become a smoker and the greater the probability of cancer in adulthood [7]. Our youngsters try smoking rates and now