<span> the person for whom something (as a disease) is or is believed to be named
</span>
The brain gets used to you taking the drug. Some drugs will affect your neurotransmitters, or messages that get sent to your brain that regulates how we think or feel. You will eventually become dependent on the drug so if you stop you might feel sick or go through "withdrawal". Which people dont want to go through so they will continue to take the drug.
Answer:
feeling nauseous
Explanation:
The conditioned response, in classical conditioning, is the response that is elicited by a conditioned stimulus (a previously neutral stimulus). In the example given in the above question, seeing a bottle on the grocery store shelf is a neutral stimulus which initially did not elicit any nauseous feeling, but is now become a conditioned stimulus that elicits a nauseous feeling, which is a conditioned response.