The document discusses the harmful effects of smoking tobacco. It notes that tobacco smoking is the second leading cause of death worldwide, killing over 5 million people per year. The document outlines that cigarettes contain over 4000 chemicals, including 43 known carcinogens. It also discusses the three types of smoke produced from cigarette smoking - mainstream, sidestream, and third-hand smoke. All three expose smokers and those around them to harmful toxins that increase risks of cancer, heart disease, and other serious health issues. The key message is that tobacco smoking has devastating long-term consequences for human health.
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