As part of a smoking cessation program, paul receives an injection of a nausea-inducing drug and then is asked to smoke a cigarette. even though he knows he is receiving the drug, it is hoped that paul will associate the nausea symptoms with smoking and will thus smoke less. this example best demonstrates the procedures typically used in

Aversive conditioning

Explanation:

Aversion conditioning is the conditioning process that is used to avoid undesired behavior. The stimuli are associated with the noxious stimulus or undesired stimulus to avoid undesired behavior or response. This is a therapy that is used to reduce the behavior that is undesirable for all.  

Thus Paul gets an injection to avoid excessive smoking. This injection is given because Paul can avoid that undesirable behavior that is not accepted in the society.  

This conditioning is useful in another disorder such as OCD.