World No Tobacco Day 2015 is on Sunday, May 31. Each year, the World Health Organization and partners highlight the health risks associated with tobacco use and advocate for effective policies to reduce tobacco consumption.

This year, WHO is calling on countries to work together to end the illicit trade of tobacco products, according to the organization’s website.

“From many angles, the illicit trade of tobacco products is a major global concern, including health, legal and economic, governance and corruption,” the WHO writes.

The WHO’s goals for this year include: raising awareness on the harm to people’s health caused by the illicit trade in tobacco products, especially the youth and low-income groups; to show how tobacco control policies, like increased tax and prices, pictorial health warnings and other measures are undermined by the illicit trade in tobacco products; to demonstrate how the tobacco industry has been involved in the illicit trade of tobacco products; and more.

Several other health organizations also observe WNTD. To mark the occasion, has put together of list of 10 important questions about tobacco use. The questions include:

  • What is the tobacco death toll?
  • But tobacco use is declining, right?
  • Is it growing anywhere?
  • What happens to your body when you quit smoking?
  • Does putting warnings on cigarette packets work?
  • How are tobacco firms responding?
  • What impact does banning smoking in public places have?
  • What about advertising?
  • What about e-cigarettes?
  • And the illegal market?