The link between tobacco use and periodontitis is well documented. As clinicians, it is our duty to inform our patients

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The link between tobacco use and periodontitis is well
documented. As clinicians, it is our duty to inform our patients
about the risks of tobacco use, and to help with cessation. In
addition, we should be asking about our patients' exposure to
second-hand smoke.
1. According to the study, environmental tobacco smoke increases
a person's risk of periodontitis by how much?
2. What is serum cotinine and how was it used in this study?
3. List some interesting things you learned by reading this
article.
4. How will this information change the way you deliver oral
health care?