Use economic theory to discuss reasons why the example

Use economic theory to discuss reasons why the example in the press article is an externality. Two pages
http://www.bbc.com/news/health-42802191
https://www.cdc.gov/heartdisease/facts.htm
Economic definition of an externality: An externality is a scenario where a third party bystander is negatively or positively affected by a market transaction between a buyer and a seller. For example, suppose I buy a cigar from Cigars R Us. In this situation, I am the buyer and Cigars R Us is the seller. If I smoke the cigar in a small office where I work with several coworkers, my coworkers will be subjected to second hand smoke, which negatively affects them. This scenario is an example of a negative externality.

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Solution: Use economic theory to discuss reasons why the example