That makes sense - at home I was breathing cigarette smoke rather than air, and my first husband wanted high carb food every meal. When I bought my own house and lived alone my heath improved enormously.
Interesting, my mum had pulmonary fibrosis, caused by nitroferantin, an antibiotic she took daily until diagnosed, her lungs were quite damaged, she wouldn't take steroids the only treatment offered. When she had another cat scan of her lungs about 8 years later, after relaxed low carbing the consultants were amazed how much her lungs had improved.