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                                    Write is the main cause of smoke | 
                            
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Answer»  Nicotine is the main addictive substance in cigarettes and other forms of tobacco. Nicotine is a drug that affects MANY parts of your body, including your brain. Over time, your body and brain get USED to having nicotine in them. About 80–90% of people who smoke regularly are addicted to nicotine. Explanation: HOPE it helps you  | 
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