I chewed tobacco for around 1 year. i get canker sores on my cheeks that take a few weeks to heal. could they be oral cancer? i have no other symptoms

Not cancer: If they are painful white ulcers that heal in a short time, they aren't cancer. You're not at much increased risk from this short time chewing and I am glad that you were able to stop this habit which in the long run is unhealthy. If you have other symptoms to suggest Behcet's or lupus or your neutrophil count (on your routine CBC), these slow-healing sores may be a warning.

Tobacco chewing: Pretty unlikely you have oral ca from chewing tobacco only for one year. However, I would recommend you seeing a specialist