What is one responsibility of a consumer when shopping?

A key responsibility of a consumer when shopping is to obey store rules, which includes rules regarding smoking. This responsibility ensures that consumers maintain respect for the store environment and the policies in place for safety and comfort of all shoppers and staff. By adhering to such rules, individuals contribute to a positive shopping experience and promote a healthy and lawful community atmosphere.

The other options do not align with the responsibilities of a consumer. For instance, shoplifting is illegal and unethical, and removing labels can mislead other consumers about a product's quality or price. Always haggling for a lower price is not a requirement or a common practice in many stores, and could create unnecessary conflict. Thus, understanding and following store rules serves as a foundational aspect of being a responsible consumer.