Chewing tobacco scratches and stains your teeth, and can cause decay.  Because chewing tobacco contains high concentrations of cancer-causing agents, chewing tobacco puts you at risk for cancer of the mouth and the throat.  

If you have been chewing for a long time, watch for the following danger signs: 

• a mouth sore that doesn't heal
• a lump or white patch inside your mouth
• chronic sore throat
• difficulty in chewing or moving the tongue or jaws

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