Thanks for your question on Healthcare Magic.
I can understand your concern.
Yes,
smoking for 4 years with exposure of other noxious substances cancer cause
emphysema and hyperinflation in later stages of life.
Along with smoking following are the possible causes for emphysema in your case.
1. Old age, age more than 50 years is independent risk factor.
2. Exposure to asbestos, chlorine, hydrocarbon, paints, other gases in Navy.
3. Second hand smoke inhalation from fellow smokers.
So all these can lead to emphysema in later stages of life.
So better to
consult pulmonologist and get done PFT (pulmonary function test).
PFT will tell you about severity of the disease and treatment is based on severity only. You will need inhaled
bronchodilator and inhaled
corticosteroids (ICS).
Don't worry, you will be alright with appropriate drugs.
Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.