They do blow and changed my life. Originally Posted by RockydocThey definitely blow but in a different way for me. I can’t seem to keep one on for more than two hours with it on and sometimes I even wake up feeling like I’m suffocating. What ends up happening is I’ll put it away and quit using it a few months until I start feeling like total shit again to the point I’m ready to try it again for a while. Glad it works for you Doc!