The ban highlights the serious problem of second hand smoking. It's a issue that is particularly affecting young women.

Are you OK with people smoking around you?

"No, but my husband is really addicted to smoking, so what can I do?"

"Absolutely not! I will stop them if I see somebody smoking while I am waiting for the bus."

The statistics are shocking.

China has an estimated more than 300 million smokers. And more than 700 million people are routinely exposed to harmful second-hand smoke.

And women all over the world are in a vulnerable position.

Figures from the World Health Organization show that smoking-related diseases take the lives of more than 1.5 million women over 20 years old every year. If no measures are taken, the number will rise by 1 million in 2030. Three quarters of them are in developing countries. In China, second-hand smoke kills more than 100-thousand people every single year.

Miss Liu, said, "A health examination found shadows in my lungs, a sign of chronic pneumonia. Doctor told me to stop smoking, but I have never-ever smoked in my life."

It's all caused by the second-hand smoke.

It is estimated that about 300 million adult women in China are constantly exposed to second-hand smoke.

Experts say that working in a smoke-filled office for eight hours is the equivalent to smoking 6 cigarettes.