众所周知，吸烟有害健康，饮酒过多也有害健康，但生活中有人即使知道也会吸烟、醉酒，你对烟酒的危害了解多少呢？请以一篇英语作文表达你对烟或酒的危害的了解。

For example

As we all know, there are many people smoking, although everyone knows smoking is harmful to us. Giving up smoking is not easy but addicted to it is quite easy, that’s why there are more and more people smoking. Smoking and passive smoking is risk factor that leads to various diseases. It has become world’s top 8 causes of death. More than 90% of lung cancer caused by smoking and lung cancer rates of smokers are 18 times over the non-smokers. Besides, smoking also causes angiocardiopathy, digestive system disease, oral disease and so on. In addition, passive smoking causes great concern in recent years. People have known that passive smoking also do great harm to human, too. Therefore, many countries and regions prohibit people from smoking in public zones, in order to reduce the harm of secondhand smoke. From my point of view, the best way to keep healthy is giving up smoke, for smoker’s own good as well as for others.