Which of the following factors did NOT contribute to the spread of tuberculosis in the late 19th century?

Name: Which of the following factors did NOT contribute to the spread of tuberculosis in the late 19th century?
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Smoking was not a recognized factor contributing to the spread of tuberculosis in the late 19th century. The other factors listed, such as weak understanding of the disease, poor workplace conditions, and stigma, did contribute to its spread during that time.

Which of the Following Factors Did NOT Contribute to the Spread