India, Dec. 27 -- A shopping centre in southern China has introduced glass windows on men's toilet doors that turn transparent when people smoke. The move, which has drawn attention online, is aimed at tackling smoking in non-smoking areas.

According to a report by the South China Morning Post, the new system has been installed in the bathrooms of Shenzhen's Shuibei International Centre and Shuibei Jinzuo Building, two jewellery malls in Guangdong province.

The glass uses special technology that is usually opaque but becomes transparent a few seconds after it detects smoke.

Notices on the doors warn visitors: "The glass will turn transparent if you smoke. Hold your urge to smoke if you do not want to become famous online."

Many online...