I was trying to figure out how my lungs got bad and thought about using an air purifier. Doctor said it wasn't that helpful except during pollen season but that I should use a cool mist humidifier to combat dry air in winter. That has helped. I have bronchiectasis (recently diagnosed) , but never smoked. I started adding potted plants to my house to purify the air and found the names of the most effective ones by googling. I like plants anyway and that, I hope, will help though should've done it long ago. I saw a program on French TV (TV 5.org) about how people are vegetating their homes now with whole walls full of plants. Anyone know more about this idea?