Final answer:
This question pertains to the health-related regulations of displaying "No smoking" signs within facilities to protect individuals from the hazards of secondhand smoke, tracing back to historical bans and modern laws.
Step-by-step explanation:
The question relates to the regulations for displaying "No smoking" signs in facilities as a measure to protect public health. Policies regarding smoking in public places have evolved significantly, especially during the first decade and a half of the 21st century.
Countries such as Bhutan have gone to the extent of making the sale of tobacco illegal, while Ireland was among the pioneers in banning smoking in enclosed spaces. Cities like Beijing have also implemented similar restrictions to safeguard the community from secondhand smoke, which poses serious health risks over time. Historical attempts to control tobacco, including warnings and smoking bans, date back to the 16th century, with further significant campaigns from governments, such as those by the Nazi regime and health notices on cigarette packaging initiated in the U.S. following research by Richard Doll and Austin Bradford Hill which showed a strong correlation between smoking and lung cancer.