Final answer:
Information about the patient's smoking habits and employment would be documented in the Social history section of the chart.
Step-by-step explanation:
In the medical chart, information about the patient's smoking habits and employment would typically be documented in the Social history section. This section focuses on capturing the patient's social and lifestyle factors, which can include information about smoking, alcohol use, occupation, education, and living conditions.
For example, in a case-control study conducted by Doll and Hill on smoking and lung cancer, they collected information on past smoking habits as part of the social history to analyze the association between smoking behavior and lung cancer.