From Stanford School of Medicine:
One common technique used
by the tobacco industry to reassure a worried public was to incorporate
images of physicians in their ads. The none-too-subtle message was that
if the doctor, with all of his expertise, chose to smoke a particular
brand, then it must be safe.
genre of ads regularly appeared in medical journals such as the Journal
of the American Medical Association, an organization which for decades
collaborated closely with the industry. The big push to document health
hazards also did not arrive until later.
The ads in this
particular theme are all from a single R. J. Reynolds campaign which ran
from 1940 to 1949 and claimed that "More Doctors smoke Camels."