A new study says that fog used in theatres and in movies is harmful to actors’ health. “Compared to the control group, the entertainment industry employees had lower average lung function test results and they reported more chronic respiratory symptoms: nasal symptoms, cough, phlegm, wheezing, chest tightness, shortness of breath on exertion, and current asthma symptoms, even after taking other factors into account such as age, smoking, and other lung diseases and allergic conditions. The entertainment industry employees also had increased rates of work-related phlegm, wheezing, chest tightness, and nasal symptoms.”