"What cigarette do doctors says causes less throat irritation? In the 1930s and 40s, tobacco companies would happily tell you it was theirs. Doctors hadn’t yet discovered a clear link between smoking and lung cancer, and a majority of them actually smoked cigarettes. So in cigarette ads, tobacco companies used doctors’ authority to make their claims about their cigarettes seem more legitimate."
When Cigarette Companies Used Doctors to Push Smoking - HISTORY