What is a viable explanation as to why some individuals suffer stem cell damage when exposed to chemical agents but others do not?

In some individuals suffer stem cell damage when exposed to chemical agents but others do not, the main reason for that is that individuals are affected by superior detoxification. Detoxification is the physiological or medicinal removal of toxic substances from a living organism, including the human body, which is mainly carried out by the liver. Additionally, it can refer to the period of withdrawal during which an organism returns to homeostasis after long-term use of an addictive substance.