I also have heard about using mullien for lung relief. It seems to be fairly safe. I am a member of consumer lab online and read their article on it. They also it is fairly safe, but as always you should talk to your doctor. Also read that drinking pineapple juice helps with mucous also. It has bromlein in it and I guess that is what helps. Researched mullien on amazon and read many reviews. Some people swore by it working and some not so much. For now, I will stick to the pineapple juice. 4 oz in am and 4 oz in pm. If nothing else, it should help with constipation. Drinking green tea helps also. Liptons green tea is their top pick.