what are four cancer causing substances in tobacco Cigarettes contain thousands of chemicals—over 7,000 have been identified—many of which toxic, and at least 70 are known to cause cancer. 🚭 When a cigarette burns, these chemicals are inhaled deep 🚭 Know the Risk Factors
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![PDF] Chemical Constituents of Tobacco Leaf and Differences among Tobacco Types](https://figures.semanticscholar.org/1a5617680435a635600482c1c3fb6850c26eb0d3/2-Table8.1-1.png)



