Indian children participate in an anti-smoking rally ahead of the World No Tobacco Day in Kolkata, capital of eastern Indian state West Bengal, on May 27, 2017. World No Tobacco Day is observed around the world every year on May 31. (Xinhua/Tumpa Mondal)

An Indian child participates in an anti-smoking rally ahead of the World No Tobacco Day in Kolkata, capital of eastern Indian state West Bengal, on May 27, 2017. World No Tobacco Day is observed around the world every year on May 31. (Xinhua/Tumpa Mondal)