On May 31, is "world no tobacco day".

Since the 1950 s, global has a large number of epidemiological studies confirm that smoking is the leading risk factors of lung cancer. In order to cause the attention of the international community to harm human health, suggested in November 1987, the world health organization will every year on April 7, as the "world no tobacco day", and in 1988 began to perform. Since 1989, the world no tobacco day to May 31 of each year.

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Is a kind of wild plants grow in South America, the first Indian to chewing tobacco or cigarettes to suck. In the global popular for over 200 years, until the 20th century, human beings began to realize the harm to human. In 1977, the American cancer society first puts forward the control smoking is a form of publicity and education, no tobacco day. This day, in the United States for nationwide smoking harm health propaganda, dissuade smokers do not smoke in the day, shop day halt to the sale of products. The United States put every November 3 weeks on Thursday as the country's no tobacco day. Later, England, Malaysia, Hong Kong and other countries and regions also successively formulated the no tobacco day.

In November 1987, the UN's world health organization recommends will every year on April 7, as the "world no tobacco day", and in 1988 began to perform. But because is established by the world health organization on April 7, anniversary, this day each year, the world health organization (who) to request a theme. In order not to interfere with the theme of health, the world health organization decided to will each year since 1989 on May 31 as world no tobacco day, China will as China's day that day.

5月31日是“世界无烟日”。

自20世纪50年代以来，全球范围内已有大量流行病学研究证实，吸烟是导致肺癌的首要危险因素。为了引起国际社会对危害人类健康的重视，世界卫生组织1987年11月建议将每年的4月7日定为“世界无烟日”，并于1988年开始执行。自1989年起，世界无烟日改为每年的5月31日。

是生长在南美洲的一种野生植物，最初印第安人将烟叶口嚼或做成卷烟吸吮。在全球盛行了200多年，直到20世纪，人类才开始认识到对人类的危害。1977年，美国癌肿协会首先提出了控制吸烟的一种宣传教育方式——无烟日。这天，在美国全国范围内进行“吸烟危害健康”的宣传，劝阻吸烟者在当天不吸烟，商店停售制品一天。美国把每年11月第3周的星期四定为本国的无烟日。以后，英国、马来西亚、香港等国家和地区也相继制定了无烟日。

1987年11月，联合国世界卫生组织建议将每年的4月7日定为“世界无烟日”，并于1988年开始执行。但因4月7日是世界卫生组织成立的纪念日，每年的这一天，世界卫生组织都要提出一项要求的主题。为了不干扰其卫生主题的提出，世界卫生组织决定从1989年起将每年的5月31日定为世界无烟日，中国也将该日作为中国的无烟日。