Final answer:
The best example of reciprocal inhibition provided is taking a half-hour walk before being allowed to smoke, as it introduces a positive action that inhibits the negative smoking behavior.
Step-by-step explanation:
In the context of a smoking cessation program, the community health nurse is discussing reciprocal inhibition as a technique to help individuals quit smoking. This approach involves introducing a positive behavior that is incompatible with the negative habit, in this case, smoking. The best example of this technique provided by the options is: "Before you can smoke, you must first take a half-hour walk." This encourages the individual to engage in a healthy activity, which is incompatible with smoking and thus inhibits the smoking behavior. Other methods, such as nicotine replacement therapy, anti-smoking campaigns, and increasing taxes on cigarettes, may also be used to help reduce the desire to smoke and support individuals in quitting the habit.