Tobacco firms paid huge amounts for endorsements from the stars of Hollywood's "Golden Age".
Industry documents released following anti-smoking lawsuits reveal the extent of the relationship between tobacco and movie studios.
One firm paid more than $3m in today's money in one year to stars.
Researchers writing in the Tobacco Control journal said "classic" films of the 1930s, 1940s and 1950s still helped promote smoking today.
Virtually all of the biggest names of the 1930s, 1940s and 1950s were involved in paid cigarette promotion, according to the University of California at San Francisco researchers. More...