Ulcer near my tonsils, should I be concerned?

Strep throat will show those ulcers and if it went untreated, it will come back. Smoking certainly doesn't help. You should have it checked out and get a strep test to see if that's what it is. I hope that's all it is. Honestly, it sounds like strep throat and if it is, your Dr will put you antibiotics. Good luck and feel better.