About percent of the lung cancer deaths worldwide, and percent in industrialized nations, are caused by cigarettes.

About 70 percent of the lung cancer deaths worldwide, and 90 percent in industrialized nations, are caused by cigarettes.
Ciiggarates contain 43 cancer causing substance, including a huge amount of Nitrosamines, which is known as one of the most potent carcinogens (cancer-causing substances known to men)