What is an early effect of tobacco on the respiratory system?

An early effect of tobacco on the respiratory system is increased airway resistance, which can lead to symptoms such as coughing and wheezing. Smokers may also experience reduced lung function and a heightened risk of respiratory infections due to impaired mucociliary clearance. These changes occur as the harmful chemicals in tobacco irritate the airways and damage lung tissue. Over time, these early effects can contribute to chronic respiratory conditions like chronic bronchitis and emphysema.