What is the most common cause of airway obstruction and choking in adults?

The most common cause of airway obstruction and choking in adults is food. This is primarily because food can easily become lodged in the throat, especially if it is not chewed properly or if a person is eating too quickly. When food enters the airway, it can block the passage of air, leading to choking, which is a medical emergency that requires immediate attention.

While other factors can contribute to airway obstruction, food remains the primary concern for adults due to the frequent nature of eating, coupled with the potential for distractions during meals. Factors like dentures or smoking may contribute to an increased risk of choking or other airway complications, but they are not as common as food itself in causing an obstruction.