The smoke released by wildfires affects human health. Wildfire smoke is mainly composed by carbon dioxide and water vapour, but there could also be carbon monoxide, formaldehyde, acrolein (toxic for the liver), polyaromatic hydrocarbons and benzene in minor concentrations. These very fine particles make up for the main danger for health, specially the crabon monoxide. The smoke can contaminate the soil and water supplies used by man. More vulnerable persons, such children under 4, elderly persons over 65, smokers, and pregnant women run a higher risk, even though the contamination is not  high and lasts for short periods of time.
Anyhow, firefighters are the most damaged by wildfire smoke, constantly in contact with these substances. They risk to suffer from chronic diseases, as they are exposed for many hours to a percentage of carbon monoxide and toxic particles that is 5-10% higher than what is bearable by a human organism.
Bronchitis, asthma and pneumonia are among the most common diseases. Fatigue, wheezes, and an increase of the heart rate are all common symptoms. We have already written about the problems that follow a direct exposure to carbon monoxide, but this gas, even when inhaled in smaller quantities, can provoke complications such cardiac dysrhythmia in people that are already suffering from a cardiovascular disease.