World No Tobacco Day started from April 7th, 1988. In 1989, World Health Organization changed this day into May 31. The essence of world no tobacco day is to broadcast the idea that smoking is bad for people's health and make more people realize the harm of the tobacco. Every year there is a theme about this day, and the theme of this year is raising tobacco tax rates. 

世界無煙日始于1988年4月17日。在1989年，世界衛生組織把世界無煙日改為每年的5月31日，其理念是為了宣傳煙草對人們的身體造成的傷害危害以及讓更多的人知道它的危害。每一年的無煙日都有一個主題，而今年的主題是“提高煙草稅”。As we all know, tobacco is the raw material of cigarette. According to the least data, 1700 billion cigarettes are being produced in China last year, more than one million people die of smoking in 2013. Smoking has a close relation with cancers. People who smoke for years are easier to have liver cancer, lung cancer, throat cancer than those not. Smoking is not only bad for people’s health, but also pollutes the air. Those who take in second-hand smoke will also suffer from breathing infections. On the surface, smoking seems to be a personal thing, it has nothing to do with the whole country, but actually, it will cost a lot of burden of the family, even the society. 我們都知道，煙草是制造香煙的原材料。根據最新的調查數據顯示，在2013年，中國一共生產了17000億支香煙，超過一百萬的人死于吸煙。吸煙與癌癥有著很大的聯系。那些吸煙多年的人比那些不吸煙的人更容易患上肝癌、肺癌和喉癌。吸煙不僅僅危害人們的身體健康，還污染空氣。那些吸入二手煙的人也會遭受呼吸方面的感染。表面上看，吸煙僅僅是個人行為，與國家無關。但是實際上，它會對家庭和社會造成很大的負擔。The government should do something to make the public realize the harm of smoking. The places such as schools, cinemas, restaurants, railway stations must not be smoked. People should get rid the bad habit of smoke. This is not only for themselves, but also for the whole world. 

政府應該做些事情讓公眾明白吸煙的危害。公共場所例如學校、餐廳、火車站不允許吸煙。人們應該戒煙。這不僅僅是為了他們自己，也是為了這個世界。