Can the damage I've done by smoking be reversed?

You haven't smoked enough for long enough to do irreversible damage. We don't tend to see irreversible damage until around 20 pack-years (packs per day x years smoked). I would be surprised if you had any noticable reduction in your FEV1 at all. Your lungs are quite likely near normal already. If there is any damage, it won't take long to recover. In most folks we start to see some degree of improvement right away. Even with a significant smoking history people are often back to normal after ten years of being smoke-free. Obviously, the less you smoked the less damage there is to recover from and the less time it will take.

If you really want to know for sure, then a pulmonary function test would be in order. Spirometry is the basic test and shows the majority of what we look for in smoking-related illness. Lung volumes and a diffusion study can help further suss out certain abnormalities, but in someone your age with such a short smoking history I'd start with just plain spirometry.

Best wishes.

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If you don't stop, the damage will be permanent... your choice

the effects of smoking can take a while to go, but some start instantly