I'm 20, 5'10'' and around 165lb. I've never had any serious health problems, but recently have been terribly afraid. Cancer runs in my family, but there are no reports of oral cancer. I have smoked for less than a year. Prior to that, I smoked a pipe in high school. That was also for less than a year. I stopped smoking for a month during the summer and encountered a problem with my mouth. On a family trip, my inner lip started tingling and it felt like I was having an allergic reaction. Some benadryl seemed to help, but there's a canker like sore where the tingling originated. I believe it comes and goes or it could just be there and only tingles occasionally. It's not an open wound, it's not bleeding or oozing and it's not numb. There's no pain associated with it, it's just a slight rise on my inner lip. One would have to compare both sides of the mouth to know it was there. I had a panic attack today in class after researching oral cancer, I'm worried that it's something other than a canker sore.