(LIU JUNXI)

Students at a vocational school in Hefei, Anhui Province, stick cigarette butts to an anti-smoking poster at an event on May 30 to mark forthcoming World No Tobacco Day.

China has over 300 million smokers, more than any other nation, with more than 2 trillion cigarettes sold every year.

Chinese and international medical experts have warned that second-hand smoke is among the major health threats in China.