I have ulcers in my mouth and i dip snuff?

No more than someone who didn't have them. As someone who has used snuff for many years, I would say to be more concerned with tooth decay and gum disease. Basically, make sure you brush your teeth and try to use mouthwash as least once a week to help prevent dental issues. Pharmaceutical companies and the doctors who are in bed with them want us to believe that one in three people will have cancer at some point in their lives. This is an absolutely ridiculous number that makes no logical sense. It's a crap shoot. Yes, some things MAY make you more prone to cancer, but even that's unknown. Doctors and scientists make assumptions based on observations made on rats in a lab somewhere, but even they will admit that they don't know for sure. Not every rat that they subject to tobacco products gets cancer so they really don't know for sure. It's a personal choice that you have to make for yourself. Just don't be scared by a bunch of over-hyped nonsense. Do some research and know the reality of cancer.