I'm going to quit dipping tobacco but is it too late to prevent mouth cancer?

Nope: Never too late to stop tobacco products. If you did it for many years, you should make sure your dentist or family doc does regular checkups.

Never too late: But just because you stop does not mean that damage has not been done. Carcinogens sometimes take years to manefest their harm. Have yourself examined routinely by your dentist for any soft tissue changes.

No: Stop, risk will decrease to no risk from dipping. See oral surgeon or ENT doc if you have any of these symptoms: Persistent mouth sore, persistent mouth pain, a lump or thickening in the cheek, a white/red patch on the gums, tongue, tonsil, or lining of the mouth, a sore throat, hoarseness or feeling that something is caught in the throat that does not go away, difficulty swallowing/chewing.