Which of the following is a physical effect of smoke on individuals?

• A. Asphyxiation
• B. Hearing loss
• C. Weight gain
• D. Hair loss

Answer: (A)

Smoke exposure primarily harms by reducing oxygen delivery to the body's tissues and by introducing toxic gases into the lungs. The most direct physical effect is asphyxiation, which happens when inhaled smoke—containing carbon monoxide and other irritants—binds to hemoglobin and damages the lungs, cutting off the body's oxygen supply. That immediate drop in oxygen can lead to dizziness, loss of consciousness, or death if exposure is prolonged.

The other options aren’t direct physical effects of smoke inhalation. Hearing loss isn’t caused by smoke itself (it would be due to loud noise or trauma). Weight gain and hair loss aren’t typical or direct results of inhaling smoke.