>>10977394> Does a safe drug even exist?Universally and unconditionally safe, no.
It is possible to overdose on any substance or material. Yes, even things which are vital for preserving your vital functions or things which seem innocuous or things which are staples in your day-to-day.
Excessive consumption of water will result in water toxemia.
Inhalation of an atmosphere composed of a high enough percentage of oxygen will result in hyperoxia.
Consuming too much of any given vitamin or mineral will have negative impacts on your health.
Saturating your body with too much caffeine, glucose, or alcohol will, unsurprisingly, kill you.
Gluttony in regard to anything is deadly. The only question is the degree to which you need to overindulge to reach that point.