All I can say is that it's very very very unlikely you got oral cancer from 1 year of smoking. Hell, even 10 years of smoking probably wouldn't give you oral cancer (though, of course, I don't recommend smoking for 10 years).
The mouth is, uh, a pretty weird place. I have fleshy bumps here and there. Ive had them forever and my dentist never said a word about them. Don't worry about this at all: you're fine.