Public smoking in China’s capital, Beijing, is now banned after the introduction of a new law, writes the BBC.
China has over 300 million smokers and over a million Chinese people die from smoking-related illnesses every year.
Smoking bans already existed in China, but have largely failed to crack down on the habit.
These tougher regulations ban lighting up in restaurants, offices and on public transport in Beijing. Thousands of inspectors will enforce the rules.
Ministry of Health guidelines published in 2011 banned smoking in all public spaces nationwide such as hotels and restaurants.
The rules were vague, however, and often flouted by Chinese smokers who are accustomed to lighting up at will.
The new rules were agreed by lawmakers in November 2014 but only came into effect on 1 June.
Under the legislation lawbreakers in Beijing will be fined 200 yuan (£21; $32) and businesses that turn a blind eye could be fined up to 10,000 yuan.
China has over 300 million smokers and a cigarette is seen as central to daily life for many people.
The World Health Organization has welcomed the new tougher regulations.