As well as nicotine, there are more than 4,000 chemicals in tobacco smoke, of which many are poisons. At least 60 of these chemicals cause cancer.Among some of the most dangerous components are:Tar: When you breathe in tobacco smoke, some tar is deposited in the lungs. Your lungs are lined with tiny hairs that help 'sweep' germs and other things out of your lungs. It is harder for these hairs to move if your lungs are coated with tar.
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