I am going to some suggestions that I believe may help you. I would like to ask you to consider eating the way that is recommended for lung cancer patients. A Typical diet for a lung cancer patient would be healthy for most people, and it emphasizes eating those things that keep your lungs strong. I will provide some links below. If you like what you see, great. If you do not, please feel free to ignore my advice.
1. https://www.lung.org/lung-health-and-diseases/lung-disease-lookup/lung-cancer/patients/treatment/stay-healthy/nutrition.html
2. https://sarahcannon.com/for-patients/learn-about-cancer/lung-cancer/nutrition.dot
3. https://www.verywellhealth.com/lung-cancer-fighting-foods-2249268
These are just some suggestions of some things you can try. If I were going to give you one tip, it would be to consider raising your protein intake. Humans are mostly water. If you set aside the water in the human body and the bones, what you have left is what I call the "soft stuff". This "soft stuff" consists of such things as skin, hair, nails, muscles, tendons, ligaments and internal organs, including the lungs. All of these items mostly consist of protein. If you are not getting enough, you will impair the ability of these body parts to repair themselves by making it harder for these body parts to replace dead cells.
The internet has protein calculators that help one calculate how much protein one should be consuming based on body weight. Just do a Google.com search on the following words (not in quotes): body weight protein calculator. If you find that your protein consumption is low, and if you like eating things like meat, dairy, and eggs, consider upping how much you consume of them. If you do not like these or do not want to eat more of these, consider perhaps getting some protein powder or protein bars if you can afford it. If you are vegan or vegetarian, they make protein powders from strictly vegetable-based sources that they sell at common health food stores like GNC. Test to see how having a protein shake before breakfast feels (If you end up eating a little less breakfast because of the shake, that is ok, just reduce your portion size of breakfast if you need to, or drink part of the shake at breakfast, put it in the fridge, and drink the rest at lunch). If you would like to do your own search, on what to eat, I recommend going to Google.com and searching on the words "diet" and "lung cancer".
Your body can do amazing things, but it needs certain building blocks to do its job. Make sure that your body has what it needs, and good luck. 
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