ClearLungs Extra Strength Homeopathic/Herbal Lung Decongestant, now in Vegetarian Capsules ClearLungs Extra Strength, combines homeopathic lung decongestants with a Chinese herbal formula for breathing and lung health. For fast temporary relief of lung congestion caused by colds and flu, allergies, smoking, pollution, athletics, or similar causes. Results are usually felt within hours, and increase with longer use.