Wow! 60 to 78 percent of chewing tobacco users have oral lesions.
Exposure to tobacco juice causes cancer of the esophagus, pharynx, larynx, stomach, and pancreas.
You can call chewing tobacco by whatever name you want – smokeless tobacco, spit tobacco, chew, chaw, plug, snuff, pinch, or dip – but don't call it harmless.
National Center for Biotechnology Information
National Cancer Institute