Final answer:
Smoking tobacco creates a negative consumption externality, specifically through second-hand smoke.
Step-by-step explanation:
Smoking tobacco creates a negative consumption externality. This means that the consumption of tobacco by individuals has a negative impact on others who are not involved in the transaction and are not compensated for the harm caused. Second-hand smoke is an example of a negative externality caused by smoking, as it can harm the health of non-smokers.