Wood smoke may smell good, but it’s not good for you. The biggest health threat from wood smoke is from its fine particles. These fine particles in wood smoke are also known as fine particulate matter or PM2.5. These microscopic particles can actually get into your eyes and respiratory system, where they may cause burning eyes, runny nose, and illnesses, such as bronchitis.

Fine particles from wood smoke can make asthma symptoms worse as well as trigger asthma attacks. Fine particles can also trigger heart attacks, stroke, irregular heart rhythms, and heart failure, especially in people who are already at risk for these conditions.