He also led the fight against tobacco smoking. He claimed that 30% of all cancer deaths could be directly attributed to tobacco. He was also the first to warn of the dangerous effects of secondhand smoke.
He was a retired pediatrician when Pres. Reagan appointed him. He was not an expert in public health, but he had a lot of common sense and became known as "America's Doctor."
http://www.washingtonpost.com/national/c-everett-koop-former-surgeon-general-dies-at-96/2013/02/25/be6cc52e-c5da-11df-94e1-c5afa35a9e59_story.html?wpmk=MK0000200