There are many types of smokeless tobacco, including chewing tobacco, plug, twist, snuff, snus, and dissovable tobacco products. The Mayo Clinic has a page with descriptions of these various types of tobacco here.
Lots of people have heard the message about smoking, and fewer people, including teens, are smoking today than even a few years ago. Unfortunately, some people consider chewing tobacco to be a safe alternative to smoking. On the contrary there are several dangers to smokeless tobacco, including the following:
- Cancer (mouth, throat, esophagus, stomach, pancreas)
- Gum disease
- Heart disease
- Precancerous mouth lesions
- Stained teeth
- Bad breath
You can find more information on these effects from the Mayo Clinic and the American Cancer Society. The National Cancer Institute also has some Questions and Answers on smokeless tobacco and some resources for quitting.