Do HEPA filters remove radon?
https://www.slideserve.com/typhan8wfk/5-easy-facts-about-radon-systems-shown-powerpoint-ppt-presentation
6 out of 7 were a combination of high radon direct exposure as well as smoking cigarettes. Therefore, if you smoke and also live in a residence with radon degrees above 4 pCi/L, there is an incredibly high danger