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Smoking increases your risk of developing a number of different cancers, but the link between smoking and lung cancer is the strongest. Cigarette smoking accounts for 87 percent of lung cancer deaths in men, and 70 percent of lung cancer deaths in women. Second-hand smoke can be just as deadly. Small-cell lung cancers are more difficult to treat than large-cell lung cancers because they’re so aggressive, but survival rates for any type of lung cancer generally aren’t good. Lung cancer is consistently listed as one of the most prevalent and deadliest cancers across the globe, but it’s also the most preventable cancer in the world.