I do consume barley juice and I have never had any issues with my lungs.How much juice are we talking about and was there a gradual upping of ounces over time?Juice can be very powerful from a cleansing stand point.Going slowly and making sure there is no mold on the grass would be a good idea.I have pics. of my barley grass in the Image Gallery in the photos section under grassmans sprouts.Do you have pics. of your grass buy any chance?If so please post so we may see them.Blessings and be well.