and Welcome to this forum! Glad you found us, it is a great place for information and support, we all are connected by this disease one way or another. Myself, I am a member just like the two of you, diagnosed now at Stage 4 (final stage, 38% lung function left) for 2 years now. You both are on the right path, quite smoking and or vaping, be proud of yourselves, it is a hard thing to accomplish and you have done it. As you have been told, there is no cure, no going back in time and it is a progressive disease. There is many things we can do for ourselves to help slow the progression and live the best lives we can. Check out the different areas of this website, just so much of information to read and learn about. Yes, can be scary at times, remember we are all different, what happens to one might not happen to another, information is our friend though.
A couple quick things is those breathing exercises that Dana30 mentioned, there is others also, just do a search in your favorite search engine and you will see. Tons of stuff on youtube.com also. Eat healthy. If you find that eating a full meal makes it a little harder to breath at times, cut back on the amount you eat at that meal and add another meal throughout the day. Example: I have 5 small meals a day and a couple snacks as I wish of course. Keep doctors appointments, take your medications as prescribed. If those medications are not working well after some time, tell your doctor immediately so a change can be made. If you have any other medical conditions keep up with those also. Avoid irritants, smells, smoke of any kind, exhaust, dust, chemicals, stay away from those that are sick if you can. Exercise, it is important to keep ourselves as strong as possible, this will help those lungs stay stronger longer, even just add some extra walking to you day to start out with, it is a super start and it helps with the depression. Speaking of that, depression, that is common for those suffering from chronic illness among other things, seek out help for it if possible, it makes a huge difference in your overall outlook on what life is still offering you. There is so much more, but that will come in time and as you read through some of the material on this website. Please always feel free to come and post, we are all here for one another. Hope this helps at least a little, many of us have been at this for decades and still going strong, you can too!