Thanks for your question on Healthcare Magic.
I can understand your concern.
Possibility of
lung cancer is very less because lung cancer is uncommon at your age of 21 years.
Possibility of
bronchitis is more because you are smoker.
Smoke irritates airways and cause inflammatory changes (bronchitis).
So better to first quit smoking. This is the most important thing in treatment.
Also
consult pulmonologist and get done
1. Clinical examination of respiratory system
2. Chest x ray (to rule out lung cancer)
3. PFT (pulmonary function test) for the diagnosis of bronchitis.
PFT will also tell about severity of the disease. And treatment is based on severity only.
You may need inhaled
bronchodilator and inhaled
corticosteroids (ICS).
Don't worry, with proper treatment, 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.