Original
There is no way to know how long your life expectancy will be. It is a matter of not putting yourself in dangerous situations. It is OK to stretch your limits, but make sure you have some fail-safes in place. If someone with MCS never has an exposure, there is no reason to expect any longevity limitations. If that person constantly is in circumstances that breathing is affected, that person's system will fail. It's all about the choices and the available resources.