Abstract
WHAT IS ALREADY KNOWN ON THIS TOPIC? The average secondhand smoke exposure rate was 68.1% in China in 2018. The World Health Organization suggests that legislation must be used to achieve a 100% smoke-free environment and protect nonsmokers from secondhand smoke. WHAT IS ADDED BY THIS REPORT? This study showed that the implementation of the Amendment Regulations on Smoking Control in Public Places of Shanghai had a significant effect on reducing the exposure rate of secondhand smoke. The rate in 2018 was 46.7%, which was significantly lower than that (58.5%) before implementation in 2016. WHAT ARE THE IMPLICATIONS FOR PUBLIC HEALTH PRACTICE? Considering the high exposure and the harm of secondhand smoke in China, it is necessary to promote smoke-free legislation and enforce tobacco control measures.