I wouldn't worry too much. You are young, your history of smoking was relatively short, and you have quit.
Lung cancer doesn't have to have symptoms. I lost my best friend of 30 years to lung cancer. She wasn't diagnosed until she was already at stage IV--the next to last stage. She died three months later. However, when I would spend weekends with her (she lived about 75 miles from me), she would cough a lot every morning for years.
But listen, this probably won't happen to you--especially since you've stopped smoking. If you parents are dead or if you have close relatives who have died, did they die from lung cancer?
Your doctor will probably recommend a chest xray once per year for a while. They say the chances of getting it go down every year you are smoke free.
I would look at family history, talk to your doctor, and go from there.
Good luck.
Mary
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