I was a chronic smoker for ten years. I have entirely stopped smoking for the…

I was a chronic smoker for ten years. I have entirely stopped smoking for the past five months. But I am worried about the after-effects of quitting smoking. Can it lead to diabetes or affect my blood sugar levels? I have gained almost 5 kg since I stopped smoking. Should I do a blood sugar test? Which tests should be done for diabetes, and how often should I do them?