My husband has COPD and has been using a salt pipe for a week. During this time he has coughed flecks of blood each morning. I do recall him coughing flecks like this maybe a year ago and the doctor telling him that it was nothing to worry about but, I'm wondering if the abrasive nature of the salt could be causing it? He thought it was doing him some good but won't use it now because of this. Has anyone else used a salt pipe and has similar results?