World No Tobacco Day is observed around the world every year on May 31. The member states of the World Health Organization created World No Tobacco Day in 1987. It draws global attention to the tobacco epidemic and to the preventable death and disease it causes. It aims to reduce the 3.5 million yearly deaths from tobacco related health problems.
- In 1987, the World Health Assembly passed Resolution WHA40.38, calling for April 7, 1988 to be "a world no-smoking day."
- In 1988, Resolution WHA42.10 was passed, calling for the celebration of World No Tobacco Day, every year on 31 May.
The health effects of tobacco smoking refer to direct tobacco smoking as well as the inhalation of environmental or secondhand tobacco smoke. The WHO in the 2002 World Health Report estimates that in developed countries, 26% of male deaths and 9% of female deaths can be attributed to smoking. Similarly, the United States' Centers for Disease Control and Prevention describes tobacco use as "the single most important preventable risk to human health in developed countries and an important cause of premature death worldwide".