Okay I've fought the urge long enough. I'm not gonna lecture on why it's bad, you guys know that.
The good thing about it is that if you are conscious about the early signs of cancer in your mouth early detection is key. The bad thing is if you don't catch it until it progresses, because it can get nasty.
For all you dippers, make sure to keep an eye out for the following: white or red spots or patches in your mouth (lips, tongue, cheeks etc)...esp in the areas that you dip, an area that is crusted over that appears to be there for a while, any persistant pain or lump in your lip etc, any sore that will bleed easily and doesn't seem to heal. Bottom line keep an eye out for these things in your own mouth and go to your dentist every 6 ms cause they are trained to catch these minor changes before they progress to cancer.