@jasmine321 Hi Jasmine.Those vests were originally designed for patiets with Cystic Fibrosis. It is intended for people who are drowning in phlegm. They may be over-prescribing these things. I have a large massager with a strong vibration on it. I used to use it on my back and it did shake stuff loose in the lungs. There is also hand-cupping. If you have a spouse that can briskly pat/pound you on the back witj their cupped hands; that also works to loosen phlegm.