Smoking
Clara's father was a big tobacco guy in Winston-Salem and he and Clara's mother (Olivia de Havilland) smoked. He was such a negative force in the film, but I guess we can assume Clara lived happily ever after, her father died of lung cancer, and her mother quit smoking (de Havilland is still alive at almost 100 ;-)
For who would bear the whips and scorns of Hollywood... (;-p)