Li Chuang is a 15-year-old boy, but he has been a smoker for three years. His teeth and fingers have turned a bit yellow. "I first tried smoking after watching TV. It makes me feel excited and I think it looks cool," he said. Not all students smoke as much as Li, but there are lots of child smokers. A report says 32% of boys and 13% of girls in middle schools in China have smoked. Some are as young as 11 when they first try! May 31stis _ . Health experts  are asking young people not to smoke. Doctors say smoking can make people get illnesses, like lung  cancer . Not only that, smoking costs a lot of money, too! Stop smoking, children! It's bad for your health. Which day is World No-Tobacco Day ?
May 31 st June 31 st May 21 st June 22 nd