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TB: Are you at risk? Tuberculosis is a contagious, infectious disease that's passed from person to person through the air. TB usually affects the lungs, but can also affect other parts of the body. |  | Smoking may increase TB risk If you smoke, you might be at increased risk of tuberculosis, a new South African study suggests. |  | Smoking may up TB risk Smoking may increase the risk of tuberculosis, say researchers at the University of California, Berkeley, who analysed data from 24 previously published studies on the subject. |  | Smoking increases TB-risk People who smoke have a greater risk of becoming infected with tuberculosis (TB) and of having that infection turn into active TB disease. |
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