This document discusses the risks of smoking and its relationship to tuberculosis (TB). It finds that smoking increases the risk of TB infection by 1.73-2.7 times, the risk of TB disease, and the risk of TB mortality. Exposure to secondhand smoke also increases the risk of TB infection, especially in children. Smokers are more likely to experience pulmonary TB and have cavitary lung lesions. Smoking can prolong the time it takes for sputum conversion during TB treatment and is a predictor of TB relapse. The document also notes that most TB patients in one study received advice to quit smoking during their treatment.