I started over again with one last night.
I am an example of what goes bad if you don't use it. I now have pulmonary hypertension. Whether it was caused by my 2 years of not using the CPap or from residual damage from my PE's is not known, however, the pulmonary specialist did say non-use will cause PH to happen. PH is VERY bad, life expectancy after diagnosis is 3-5 years AT BEST.
BTW, because of my PE I was told NOT to use it by my doctors.
My CPap has a memory card in it. If I do not use the CPAP for at least 4 hours a day, my payment vendor (in this care medicare) will NOT pay for the CPAP and will bill ME for it.
Your insurance provider may have the same arrangement.