Is anyone in the community using an oximizer pendant cannula? My Pulmonary doctor recommended this for me to use during the day other then the regular cannulas. I found the oximizer to be a very hard plastic and very heavy, also makes my nostrils very sore. The tubing is twice as large as the regular cannulas I have been using . Its hard to keep up my nose and around my ears due to its thickness, weight, and being so uncomfortable. I ware it so that the pendant is in the back of my head which makes it a little comfortable. Have any of you had this problem with the stiffness of this cannula and if so how did you soften it? I would like to continue its use but find it very irritating heavy and uncomfortable.