A study carried out by researchers at the COPD Program at Lovelace Respiratory Research Institute in Albuquerque found out that smoking was associated with the overproduction of mucus that causes bronchitis. They reported their findings in the Journal of Respiratory and Critical Care Medicine.
It found out that people who are exposed to a lot of secondhand smoke, people with weakened immune systems, the elderly and infants, people with gastroesophageal reflux disease (GERD) and those who are exposed to irritants at work, such as chemical fumes from ammonia, strong acids, chlorine, hydrogen sulfide, sulfur dioxide or bromine were at great risk of bronchitis.
The people who are exposed to air pollution were discovered to be in close association between exposure to components of air pollution and acute bronchitis in preschool-aged kids. The air particulates, known as PAHs (polycyclic aromatic hydrocarbons) originate from vehicle exhaust, wood-burning stoves, tobacco smoke, coal burning, and grilling food. Another study found that more people die in the United Kingdom from traffic pollution than from automobile accidents.