Peroxide can help with cleaning the lungs out, primarily by increasing macrophage activity on the lung surface. BUT, there are several things to keep in mind. One is that I do not recommend using the 3% in the brown bottles. These use acidic stabilizers such as phosphoric acid. I someone does this I recommend only using food grade hydrogen peroxide THAT HAS BEEN DILUTED. A 3% solution can be made by adding one ounce of the food grade peroxide to 11 ounces of distilled water. And I would even dilute this down further to maybe a half a percent or less. Remember that the body generates peroxides to activate white blood cells, but it only needs traces of the peroxide to do this.