To call anesthesia a poison might be a bit harsh!

A poison is : a substance that through its chemical action usually kills, injures, or impairs.

I would like to think that a general anesthetic includes agents that provide amnesia, analgesia and cardiac stablility that usually do not kill , injure or impair in the presence of a trained anesthesia provider.

General anesthesia consists of inhalational agents , narcotics , benzodiazepines, hypnotics , & muscle paralytics for the most part.. A balanced anesthetic can consist of just one or all of the above depending on the nature of the procedure and the choice/experience of the anesthetist(nurse or M.D.).

It is true that each of the individual components has a lethal dose(which varies according to age , weight , volume of distribution).

While one does get to choose u're surgeon most people don't get to choose their anesthesia provider but obviously vigilance, competence and experience are mandatory...