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What chemicals are in cigarettes?

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Question in full: How many different chemicals are there in cigarette smoke?
The main ingredient in cigarettes is tobacco but over 600 different chemicals can be added, of these at least 50 are known to cause cancer in humans. Some things are added to change or improve the flavour. Other chemicals are added to change the way the nicotine gets to the brain, or to change the way the cigarette burns. Smoking a cigarette is actually one of the most un-healthy things a person can do. The website www.quit-smoking-stop.com has good and useful information on chemicals added.