ORIGINAL: davidhardegree
I bought one of those cough silencers and I am not sure what to think of it. When I cough, I cough from the bottom of my feet all the way up sometimes bringing oisters up with it. (I know it's nasty) But, with all that pressure in the cough, air rushes out of the corners of my mouth when the lips break their seal making a hissing sound.
I had the same problem ,
then I found that making a ring of your thumb and forefinger and pressing it around your lips as you cough into the muffler improves the seal . You also have to be careful to replace the cotton balls with just the right amount and placement for the thing to work at it's best . More cotton is not a plus and reduces it's ability to muffle the sound . It has to have some airflow to work right .