Thanks for your question on Health Care Magic.
I can understand your concern.
Neck pain and swollen glands in neck in chronic smoker can be due to either infection or cancer.
So possibility of
throat infection or cancer in neck (vocal cords, pharynx, larynx etc) is more.
So better to quit
smoking as soon as possible.
Consult ENT doctor and get done
1. Clinical examination of neck
2.
CT scan of neck
3. Endoscopic examination of pharynx and larynx.
You may need biopsy if there is any mass lesion.
You may need antibiotic, anti
histamine and anti inflammatory drugs if it is infection.
Don't worry, you will be alright but first quit smoking.
Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.