Arrange these events in a plausible sequence from passive smoke exposure to an airway effect described in the material.

### The order 1. Smoke toxins reach a non-smoker through inhalation. Exposure must occur before its effects can develop. 2. The airways are exposed to smoke irritants. Inhaled smoke comes into contact with the respiratory passages. 3. Airway irritation or inflammation develops. The material identifies smoke as a cause of irritation and inflammation. 4. Breathing symptoms such as coughing may occur. Coughing is a symptom that can follow airway irritation. ### The concept Passive exposure occurs when a person breathes smoke from others. Irritants act on the airway lining and can contribute to inflammation and symptoms. The sequence represents a general pathway described by the material, not a claim that every exposed person develops the same symptom. ### Terms - **Airway**: A passage that carries air into or out of the lungs. - **Inflammation**: The body's response to irritation or injury, which can cause swelling. ### Remember Exposure comes before airway irritation, and symptoms can follow irritation.