Is this lung cancer ?

5 days back came from Boston to my home town in sf .

While coming back got fever on the flight. 2 days later intense coughing and then called doctors . Doctors checked and told me it was bronchitis and prescribed me antibiotics . It’s been 5 days but coughing has not stopped . Fever went away in 2 days . But coughing with white phelm and also post nasal drip .

Some of my history - was light smoker from 2002-2022 (4-5 cigarrates ( not packs ) per day ) . From 2022 end till 10 days ago vaping. Stopped vaping completely 10 days ago . So no smoking and no vaping .

Did a ct scan back in 2018 and had a 2mm nodule in right lung. But bi issues after that .

Doctor asked me to do ct scan again but he is confident that this is bronchitis and nothing else .

I am 47 years age old living in USA for last 20 years but of Indian origin .

Should I be worried or concerned ?