This source is credible because it is the site for the CDC (Centers for disease Control
and Prevention. The CDC is a major organization in the U.S. that works 24/7 to protect America from health, safety, and security threats both foreign and domestic. The director of the CDC Thomas Frieden, MD, MPH received both his medical degree and master’s of public health degree from Columbia University. He also completed infectious disease training at Yale University. By U.S. News Columbia and Yale are top four best colleges in America. The source is very credible as well due to the fact of all the references it used.
This source will be useful because it explains the actual problems a body can have and then stating why smoking can make it worse. This can extremely be useful in my paper because I can show ways how bad a disease can be already the show how smoking ca make it worse. Also this source has many facts on why secondhand smoking is bad, which will be a critical factor in my research paper.