According to 2paragraphs, Helena smoked so much during the filming of Fight Club that she got bronchitis; her parting gift to director, David Fincher was an x-ray of her lungs.
Because Fincher wanted Marla always to be wreathed in cigarette smoke, he made the actress smoke constantly. “He got obsessed with the smoke. It had to float in a particular way. So I was just always sitting there in a cemetery of cigarette butts.” She smoke so much that she contracted bronchitis. Her farewell gift to him at the end of filming was an x-ray of her lungs.