For a 14 Year Old Smoker – Gum Disease?

I'm almost 15 and I just recently started smoking. Since April I've smoked about 2 packs. So not very often, Just a lot of stress in my life and I just realized I have a sore above one of my teeth where the gum meets the tooth. It's kind of red and a little bit bloody (If I mess with it.) It hurts and it feels kind of raw.
I brush my teeth regularly and I wear a retainer.
Is this a sign of Gum cancer or disease? Or just brushing too hard?
How do I fix it?
Thanks

Suggestion:

You're only 14.

Unless you have been smoing since you were 3, I would stop worrying about it for now. But for the love of god man, smoking at your age is absurd.

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