Many things: Nicotine and a multitude of other poisons and toxins. Also, the heating and drying out of the oral tissues is harmful. Everything bad, nothing good. Not to mention the harmful effects on your skin, and the irritation of the eye tissues. Just look at the faces of smokers and see the facial movements as they smoke. Think hard about this addiction and quitting it for your health. Good Luck.
Answered 4/30/2015
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Tobacco and nicotine: Smoking causes stroke, heart disease, cancer and is the leading cause of death in the United States. Nicotine is the drug that makes tobacco addictive. Ask your doctor about tobacco-cessation program and help
Answered 4/25/2015
2.9k views
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