很明显吸烟是引起疾病和过早死亡的原因。在65岁以下的男性中,肺癌病例的90％、慢性支气管炎和肺气肿的75％、缺血性心脏病的25％都是吸烟造成的。还有许多其它疾病,如癌症、妇女妊娠期并发症以及受他们家庭成员吸烟影响的儿童呼吸系统疾病。在东南亚,估计嚼烟引起口腔癌致死的约90％。 It is clear that smoking is the cause of illness and premature death. Among men under the age of 65, 90% of lung cancer cases, 75% of chronic bronchitis and emphysema, and 25% of ischemic heart disease are caused by smoking. There are many other diseases such as cancer, pregnancy complications in women, and respiratory diseases in children affected by smoking in their families. In Southeast Asia, chewing tobacco is estimated to cause about 90% of oral cancer deaths.