With only 1 CF mutation (most likely your case), it is possible have some pulmonary problems as a result, especially if its the delta-F508 mutation (CF gene is deleted in F508). There's recent research in this article:
Single mutation in the cystic fibrosis transmembrane regulatory gene in patients with chronic sinusitis and hypogammaglobulinemia*1A novel immunodeficiency
Journal of Allergy and Clinical Immunology, Volume 113, Issue 2, Page S44
I didn't discover that I had 2 CF genes until I was 32 and getting genetic testing for my pregnancy. Luckily, my son is OK, and I'm doing a lot better health-wise than most people with CF. I did have chronic bronchitis as a kid, but it cleared up in adolescence after a few years of taking massive antibiotics for my acne. But now I hear from my GI doctor that recent research shows that heavy antibiotic use can permanently damage intestinal motility. Big trade-off.
In the last 5 years, I've had a couple of really bad episodes of a mystery stomach ailment (debilitating stomach pain). My gut problems are not like the classical CF patient, as I am pancreatic-sufficient. I get constipated a lot, often with mucus in my stool, despite drinking 2-3 liters of water a day and eating my vegetables (could be the antibiotic damage? who knows?). I also get some type of stomach acid every day, and I just eat a few Tums and forget about it. There is some new research about pancreatic sufficient CF patients that begin to suffer from pancreatitis as they get older, and I have a suspicion that is what's happening with the stomach pain episodes. My GI doctor says that when it happens again, I need to get my blood tested for pancreatic enzymes IMMEDIATELY,since the window of time to tell if it's pancreatic is very, very small. It could be missed within an hour or two. Admittedly, I am a very, very rare case of an unlikely combination of CF genes, or so the geneticist told me, so it's hard to get doctors to understand if any of my problems are related to CF.
As for pulmonary problems, I treat every sinus infection the second it comes on with liberal doses of Simply Saline spray and try very hard to not let anything drop into my lungs. One time when I was having a severe histamine reaction with an overwhelming amount of snot, I found some relief by taking a little bit of my son's Prednosolone. When I told my doc about it, he said I should have just asked for a Flo-nase prescription instead, if I found relief from steroidal drugs.