My girlfriend bought me one for Christmas and I noticed my chest felt tighter, and I was getting some pain when breathing. I was also on the verge of becoming ill and sick, which I got over - but gave the salt lamp away. Later after feeling better I went over to a friends for a few hours to hang out and play board games who had one on in her bedroom, and I felt the same tightening of my chest. I'm not sure if it's just me or not, maybe someone else has a better experience with it. I was hopeful at first, but not so much anymore.