Which of the following is NOT listed as a physical effect of smoke in the cabin?

• A. Watering eyes
• B. Choking
• C. Asphyxiation
• D. Headache

Answer: (D)

Smoke in the cabin primarily irritates the eyes and airways and can reduce the oxygen available to the body. Watering eyes occur because the conjunctiva are irritated by smoke particles, leading to tear production. The choking sensation comes from irritation and swelling of the airways, making it feel difficult to breathe. Asphyxiation can happen when smoke exposure lowers the oxygen level and impairs oxygen delivery to the body's tissues. Headache isn’t listed as a direct physical effect of cabin smoke in the standard safety references—it's more of a possible secondary symptom when hypoxia or dehydration occurs, but it isn’t a primary effect named for smoke exposure.