New Delhi, Dec. 28 -- A shopping centre in southern China has introduced a new way to stop people from smoking inside men's toilet cubicles. The glass doors will turn transparent under one condition.

Two shopping malls in Shenzhen, the Shuibei International Centre and the Shuibei Jinzuo Building, have resorted to a new technology. They have installed special glass doors that stay opaque during normal use. However, they turn transparent within seconds if smoke is detected, according to the South China Morning Post.

A notice warns users that the glass will reveal them if they smoke. It jokingly says they might become "famous online".

In China, Shenzhen is one of the cities that keeps a strict no-smoking rule for all indoor public places....