In the teenage smoking example, which component functions as the vector/vehicle?

• A. Host
• B. Cigarettes
• C. Advertising
• D. Social setting

Answer: (C)

The key idea is that a vector or vehicle is the medium that carries the exposure to the host. In the teenage smoking scenario, the host is the teen, and the exposure is the risk of starting to smoke (the behavior and its nicotine exposure). Advertising acts as the vehicle because it conveys and disseminates the message that smoking is desirable, normal, or easy to access, thereby delivering the exposure to the teen and influencing initiation. The cigarettes are the product that delivers nicotine once smoking begins, and the social setting is part of the environment that can shape behavior, but they are not the channel that transmits the exposure itself. Advertising is the medium that conveys the risk to the host, making it the vehicle.